Dr. Nathan R. Walker , MD
Internal Medicine โข Champaign, IL
1801 W Windsor Rd
Champaign, IL 618226217
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Dr. Nathan Walker is listed in NPPES under Internal Medicine.
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NPI assigned on August 5, 2006; this date does not establish years in practice.
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Published CMS data list 9,416 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- J0897 โ Injection, denosumab, 1 mg: 1,860 service units.
- G2211 โ Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's: 956 service units.
- 99214 โ Established patient outpatient office visit: 898 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPTยฎ only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 48 records in the table ยท Guide: How to read Medicare Part B data
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Published CMS data list 16,819 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Atorvastatin Calcium โ 1,048 prescription fills, including refills.
- Levothyroxine Sodium โ 692 prescription fills, including refills.
- Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) โ 653 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 200 records in the table ยท Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 95% of clinicians listed under Internal Medicine in Champaign, IL (2024, 21 clinicians with data). Median for this group: 1,081. Middle half: 260 to 2,831.
More Medicare Part B services than 95% of clinicians listed under Internal Medicine in Illinois (2024, 3,249 clinicians with data). Median for this group: 699. Middle half: 285 to 1,340.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 9,587 in 2020 to 9,416 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
1801 W Windsor Rd
Champaign, IL 618226217
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Christie Clinic, Pllc. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
University Of Cincinnati College Of Medicine
2002
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
551 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider, 2024.
Medicare-allowed amount
About $327,329 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
Paid by Medicare
About $259,925 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
30-day fills
37,886 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$1,732,228 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $20.36 in 2024
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2024.
Years since graduation
24 years (graduated 2002)
CMS Doctors and Clinicians data list 2002 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2006
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, โDoes your provider accept Medicare as full payment?โ
Telehealth (some services)
Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.
You may be able to have some visits without going to the office. Ask which visits can be done by telehealth.
What this does not show: Telehealth (some services)
It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Walker has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Walker as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Champaign and Illinois
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 95% of clinicians listed under Internal Medicine in Champaign, IL (2024, 21 clinicians with data). Median for this group: 1,081. Middle half: 260 to 2,831.
More Medicare Part B services than 95% of clinicians listed under Internal Medicine in Illinois (2024, 3,249 clinicians with data). Median for this group: 699. Middle half: 285 to 1,340.
Medicare-allowed amount
A higher Medicare-allowed amount than 95% of clinicians listed under Internal Medicine in Champaign, IL (2024, 21 clinicians with data). Median for this group: $81,207. Middle half: $17,540 to $128,611.
A higher Medicare-allowed amount than 95% of clinicians listed under Internal Medicine in Illinois (2024, 3,249 clinicians with data). Median for this group: $67,802. Middle half: $27,619 to $124,679.
Paid by Medicare
A higher Medicare payment amount than 95% of clinicians listed under Internal Medicine in Champaign, IL (2024, 21 clinicians with data). Median for this group: $61,825. Middle half: $13,145 to $100,900.
A higher Medicare payment amount than 95% of clinicians listed under Internal Medicine in Illinois (2024, 3,249 clinicians with data). Median for this group: $52,838. Middle half: $21,117 to $98,214.
Medicare Part D prescriptions
More Part D prescriptions than 90% of clinicians listed under Internal Medicine in Champaign, IL (2024, 22 clinicians with data). Median for this group: 5,544. Middle half: 163 to 9,400.
More Part D prescriptions than 95% of clinicians listed under Internal Medicine in Illinois (2024, 3,755 clinicians with data). Median for this group: 1,030. Middle half: 99 to 4,658.
Part D drug cost
A higher Part D drug cost than 90% of clinicians listed under Internal Medicine in Champaign, IL (2024, 22 clinicians with data). Median for this group: $391,447. Middle half: $11,078 to $933,953.
A higher Part D drug cost than 95% of clinicians listed under Internal Medicine in Illinois (2024, 3,755 clinicians with data). Median for this group: $78,716. Middle half: $2,604 to $371,507.
31 active clinicians are listed under Internal Medicine with a practice address in Champaign, IL (7,245 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Champaign
38.7% of these 31 clinicians have the CMS telehealth indicator.
74.2% of these 31 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services stayed about the same: 9,587 in 2020 and 9,416 in 2024.
- 2020: 9,587
- 2021: 9,944
- 2022: 10,107
- 2023: 9,048
- 2024: 9,416
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Medicare-allowed amount
Medicare-allowed amount stayed about the same: $303,507 in 2020 and $327,329 in 2024.
- 2020: $303,507
- 2021: $342,667
- 2022: $336,609
- 2023: $323,214
- 2024: $327,329
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Paid by Medicare
Paid by Medicare increased 10% from $235,574 in 2020 to $259,925 in 2024.
- 2020: $235,574
- 2021: $269,403
- 2022: $264,211
- 2023: $255,979
- 2024: $259,925
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Medicare Part D prescriptions
Medicare Part D prescriptions stayed about the same: 15,664 in 2020 and 16,819 in 2024.
- 2020: 15,664
- 2021: 16,391
- 2022: 16,024
- 2023: 16,087
- 2024: 16,819
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30-day fills
30-day fills stayed about the same: 35,328 in 2020 and 37,886 in 2024.
- 2020: 35,328
- 2021: 37,024
- 2022: 36,520
- 2023: 36,644
- 2024: 37,886
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Part D drug cost
Part D drug cost increased 37% from $1,264,158 in 2020 to $1,732,228 in 2024.
- 2020: $1,264,158
- 2021: $1,393,050
- 2022: $1,393,518
- 2023: $1,719,604
- 2024: $1,732,228
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $64.15 in 2020 to $20.36 in 2024.
- 2020: $64.15
- 2021: $83.27
- 2022: $141.52
- 2023: $27.86
- 2024: $20.36
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2024 (payments made January 1 โ December 31, 2024): fewer than 11 records totaling $20.36.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Kowa Pharmaceuticals America, Inc. |
Food and Beverage
In-kind items and services
|
LIVALO | General | $20.36 |
Source: CMS Open Payments, program year 2024, released June 30, 2026.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016โ2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ by Provider and Service data, 2017โ2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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J0897
Injection, denosumab, 1 mg
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1,860 | 17 | $70.00 | $25.56 |
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G2211
Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's
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956 | 441 | $49.00 | $15.83 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
|
898 | 442 | $252.00 | $121.02 |
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36415
Insertion of needle into vein for collection of blood sample
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700 | 391 | $32.00 | $8.57 |
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80053
Blood test, comprehensive group of blood chemicals
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548 | 371 | $111.00 | $10.30 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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487 | 287 | $171.00 | $84.84 |
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83036
Hemoglobin a1c level
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473 | 356 | $96.00 | $9.44 |
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85025
Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count
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465 | 356 | $67.00 | $7.58 |
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84443
Blood test, thyroid stimulating hormone (tsh)
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402 | 352 | $151.00 | $16.37 |
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80061
Blood test, lipids (cholesterol and triglycerides)
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370 | 343 | $190.00 | $12.99 |
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82306
Vitamin d-3 level
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239 | 233 | $286.00 | $28.78 |
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J3301
Injection, triamcinolone acetonide, not otherwise specified, 10 mg
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162 | 29 | $3.00 | $0.96 |
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G0439
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit
|
159 | 159 | $301.00 | $123.52 |
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84153
Psa (prostate specific antigen) measurement, total
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133 | 128 | $172.00 | $18.02 |
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82043
Urine microalbumin (protein) level
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132 | 110 | $117.00 | $5.50 |
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82570
Creatinine level to test for kidney function or muscle injury
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132 | 110 | $61.00 | $4.94 |
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96372
Injection of drug or substance under skin or into muscle
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115 | 43 | $57.00 | $13.24 |
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84439
Thyroxine (thyroid chemical), free
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88 | 75 | $106.00 | $8.77 |
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99490
Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month
|
85 | 85 | $122.00 | $60.12 |
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86235
Measurement of antibody for assessment of autoimmune disorder, any method
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73 | 17 | $121.00 | $17.57 |
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G0103
Prostate cancer screening; prostate specific antigen test (psa)
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70 | 70 | $141.00 | $18.92 |
|
82607
Cyanocobalamin (vitamin b-12) level
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62 | 58 | $153.00 | $14.78 |
|
G0008
Administration of influenza virus vaccine
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61 | 60 | $32.00 | $31.15 |
|
82728
Ferritin (blood protein) level
|
60 | 51 | $129.00 | $13.36 |
|
90662
Influenza vaccine split virus, preservative free
|
56 | 55 | $184.00 | $80.94 |
(top 25 shown)
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Atorvastatin Calcium | Atorvastatin Calcium | 1,048 | 85,323 | $13,749.76 | 287 |
| Levothyroxine Sodium | Levothyroxine Sodium | 692 | 57,042 | $7,884.09 | 178 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 653 | 17,567 | $17,305.40 | 125 |
| Amlodipine Besylate | Amlodipine Besylate | 650 | 55,225 | $6,238.69 | 201 |
| Lisinopril | Lisinopril | 591 | 48,001 | $4,681.13 | 172 |
| Losartan Potassium | Losartan Potassium | 391 | 33,708 | $5,526.38 | 117 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 380 | 33,077 | $5,448.32 | 130 |
| Hydrochlorothiazide | Hydrochlorothiazide | 350 | 29,996 | $1,650.93 | 108 |
| Omeprazole | Omeprazole | 339 | 27,791 | $5,085.65 | 103 |
| Metoprolol Succinate | Metoprolol Succinate | 320 | 25,874 | $5,168.02 | 88 |
| Metformin Hcl | Metformin Hcl | 318 | 25,324 | $3,740.03 | 92 |
| Tramadol Hcl | Tramadol Hcl | 270 | 7,882 | $1,751.90 | 63 |
| Gabapentin | Gabapentin | 247 | 14,725 | $5,642.98 | 68 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 246 | 5,926 | $9,258.15 | 78 |
| Simvastatin | Simvastatin | 241 | 21,549 | $2,834.70 | 69 |
| Pantoprazole Sodium | Pantoprazole Sodium | 240 | 18,666 | $4,394.05 | 70 |
| Trazodone Hcl | Trazodone Hcl | 239 | 18,736 | $2,233.15 | 70 |
| Eliquis | Apixaban | 219 | 13,267 | $254,958.77 | 49 |
| Furosemide | Furosemide | 218 | 13,226 | $1,200.56 | 60 |
| Allopurinol | Allopurinol | 212 | 17,190 | $2,351.95 | 57 |
| Tamsulosin Hcl | Tamsulosin Hcl | 200 | 17,106 | $4,261.18 | 61 |
| Carvedilol | Carvedilol | 190 | 14,855 | $2,849.04 | 55 |
| Jardiance | Empagliflozin | 187 | 11,857 | $227,508.68 | 49 |
| Lisinopril-Hydrochlorothiazide | Lisinopril/Hydrochlorothiazide | 184 | 16,263 | $1,877.37 | 51 |
| Alendronate Sodium | Alendronate Sodium | 179 | 13,370 | $2,321.20 | 55 |
(top 25 shown)
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2022-01-05NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20051101001061
IL
8426075029
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Christie Clinic, Pllc
1120 N Melvin St, Gibson City, IL 609361477
Phone: 2177844251
Christie Clinic, Pllc
1710 E Windsor Rd, Urbana, IL 618029564
Phone: 2173449440
Christie Clinic, Pllc
109 W University Ave, Champaign, IL 618203909
Phone: 2173665180
Christie Clinic, Pllc
209 W Borman Dr, Rantoul, IL 618663632
Phone: 2178939671
Christie Clinic, Pllc
300 N Main St, Tuscola, IL 619531406
Phone: 2172539258
Christie Clinic, Pllc
108 Robinson St, Danville, IL 618328515
Phone: 2174428611
Christie Clinic, Pllc
101 W University Ave, Champaign, IL 618203909
Phone: 2173661200
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Surgery - Vascular Surgery
Doctor of Medicine (M.D.)
Internal Medicine - Pulmonary Disease
Doctor of Medicine (M.D.)
Radiology - Radiation Oncology
Doctor of Medicine (M.D.)
Obstetrics & Gynecology
Doctor of Medicine (M.D.)
Family Medicine
Doctor of Medicine (M.D.)
Nurse Practitioner
Nurse Practitioner
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 1801 W WINDSOR RD, CHAMPAIGN, IL 618226217 (Tel: 2173662660)
NPI status registered as active in NPPES database
Registered at 501 N DUNLAP AVE, SAVOY, IL 618748403 (Tel: 2173662660)
Registered at 101 W UNIVERSITY AVE, CHAMPAIGN, IL 618203909 (Tel: 2173668107)
Recorded as NATHAN WALKER, M.D.
Internal Medicine (license number reported to NPPES: IL 036-114466)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Internal Medicine Providers in Champaign
- Dr. Matthew Kresca, MD
- Dr. Kathleen Collins, MD
- Dr. Jennie Hsu-Lumetta, MD
- Dr. Sabrina Khan, MBBS, MD
- Dr. Owaise Mansuri, MD
- Dr. John Peterson, MD
Mailing Address
101 W University Ave
Champaign, IL 618203909
Phone: 2173668107