Dr. Randall S Williams , MD
General Practice • Chico, CA
1040 Mangrove Ave
Chico, CA 959263509
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. Randall Williams is listed in NPPES under General Practice.
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NPI assigned on July 6, 2006; this date does not establish years in practice.
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Published CMS data list 71,586 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- J3111 — Injection, romosozumab-aqqg, 1 mg: 22,051 service units.
- J0897 — Injection, denosumab, 1 mg: 12,480 service units.
- J3304 — Injection, triamcinolone acetonide, preservative-free, extended-release, microsphere formulation, 1 mg: 5,792 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
See all 106 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 19,084 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Rosuvastatin Calcium — 1,563 prescription fills, including refills.
- Levothyroxine Sodium — 756 prescription fills, including refills.
- Amlodipine Besylate — 728 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 190 records in the table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 95% of clinicians listed under General Practice in California (2024, 409 clinicians with data). Median for this group: 485. Middle half: 154 to 2,019.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 51,898 in 2020 to 71,586 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
1040 Mangrove Ave
Chico, CA 959263509
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: Mangrove Medical Group. 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
Loma Linda University School Of Medicine
1986
What Public CMS Data Show
General Practice: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
1,534 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 – by Provider, 2024.
Medicare-allowed amount
About $1,618,191 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 – by Provider and Service, 2024.
Paid by Medicare
About $1,337,697 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 – by Provider and Service, 2024.
30-day fills
41,975 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
$1,953,133 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 – by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $4,528.15 across 258 records.
By nature of payment
- Food and Beverage: $4,528.15 across 258 records.
Reporting-company totals (3 largest of 36)
- ABBVIE INC.: $798.27 across 56 records.
- Amgen Inc.: $620.85 across 50 records.
- Novo Nordisk Inc: $435.53 across 20 records.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
40 years (graduated 1986)
CMS Doctors and Clinicians data list 1986 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, “Does your provider accept Medicare as full payment?”
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. Williams 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. Williams 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 Chico and California
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 95% of clinicians listed under General Practice in California (2024, 409 clinicians with data). Median for this group: 485. Middle half: 154 to 2,019.
Too few clinicians listed under General Practice in Chico have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A higher Medicare-allowed amount than 95% of clinicians listed under General Practice in California (2024, 409 clinicians with data). Median for this group: $45,658. Middle half: $15,010 to $165,277.
Too few clinicians listed under General Practice in Chico have Medicare Part B data for 2024 to compare.
Paid by Medicare
A higher Medicare payment amount than 95% of clinicians listed under General Practice in California (2024, 409 clinicians with data). Median for this group: $32,130. Middle half: $11,436 to $131,972.
Too few clinicians listed under General Practice in Chico have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
More Part D prescriptions than 95% of clinicians listed under General Practice in California (2024, 610 clinicians with data). Median for this group: 758. Middle half: 125 to 3,707.
Too few clinicians listed under General Practice in Chico have Medicare Part D data for 2024 to compare.
Part D drug cost
A higher Part D drug cost than 95% of clinicians listed under General Practice in California (2024, 610 clinicians with data). Median for this group: $48,894. Middle half: $2,044 to $279,308.
Too few clinicians listed under General Practice in Chico have Medicare Part D data for 2024 to compare.
13 active clinicians are listed under General Practice with a practice address in Chico, CA (1,963 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Chico
30.8% of these 13 clinicians have the CMS telehealth indicator.
46.2% of these 13 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 increased 38% from 51,898 in 2020 to 71,586 in 2024.
- 2020: 51,898
- 2021: 65,310
- 2022: 62,676
- 2023: 56,675
- 2024: 71,586
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Medicare-allowed amount
Medicare-allowed amount stayed about the same: $1,751,376 in 2020 and $1,618,191 in 2024.
- 2020: $1,751,376
- 2021: $1,815,113
- 2022: $1,390,552
- 2023: $1,401,094
- 2024: $1,618,191
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Paid by Medicare
Paid by Medicare stayed about the same: $1,420,677 in 2020 and $1,337,697 in 2024.
- 2020: $1,420,677
- 2021: $1,474,971
- 2022: $1,137,763
- 2023: $1,153,302
- 2024: $1,337,697
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Medicare Part D prescriptions
Medicare Part D prescriptions stayed about the same: 19,260 in 2020 and 19,084 in 2024.
- 2020: 19,260
- 2021: 18,009
- 2022: 17,025
- 2023: 17,495
- 2024: 19,084
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30-day fills
30-day fills stayed about the same: 42,336 in 2020 and 41,975 in 2024.
- 2020: 42,336
- 2021: 41,260
- 2022: 38,673
- 2023: 38,849
- 2024: 41,975
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Part D drug cost
Part D drug cost increased 24% from $1,570,758 in 2020 to $1,953,133 in 2024.
- 2020: $1,570,758
- 2021: $1,611,367
- 2022: $1,586,313
- 2023: $1,960,129
- 2024: $1,953,133
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Industry payments (Open Payments)
Industry payments (Open Payments) decreased 18% from $5,541.91 in 2021 to $4,528.15 in 2025.
- 2021: $5,541.91
- 2022: $7,371.20
- 2023: $4,538.06
- 2024: $4,049.69
- 2025: $4,528.15
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · 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 2025 (payments made January 1 – December 31, 2025): 258 records totaling $4,528.15.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
|
FASENRA | General | $155.51 |
| Madrigal Pharmaceuticals |
Food and Beverage
In-kind items and services
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REZDIFFRA | General | $122.19 |
| Madrigal Pharmaceuticals |
Food and Beverage
In-kind items and services
|
REZDIFFRA | General | $45.43 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
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EVENITY | General | $33.60 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
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EVENITY | General | $33.60 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
|
EVENITY | General | $33.33 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
|
EVENITY | General | $33.27 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
|
EVENITY | General | $32.19 |
| Madrigal Pharmaceuticals |
Food and Beverage
In-kind items and services
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REZDIFFRA | General | $32.14 |
| VERTEX PHARMACEUTICALS INCORPORATED |
Food and Beverage
In-kind items and services
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JOURNAVX | General | $31.60 |
| Fresenius Kabi USA, LLC |
Food and Beverage
In-kind items and services
|
— | General | $31.56 |
| Madrigal Pharmaceuticals |
Food and Beverage
In-kind items and services
|
REZDIFFRA | General | $31.50 |
| VERTEX PHARMACEUTICALS INCORPORATED |
Food and Beverage
In-kind items and services
|
JOURNAVX | General | $31.26 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
VRAYLAR | General | $30.54 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
UBRELVY | General | $29.57 |
| Axsome Therapeutics, Inc. |
Food and Beverage
In-kind items and services
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Auvelity | General | $28.98 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
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Wegovy | General | $28.36 |
| Daiichi Sankyo Inc. |
Food and Beverage
In-kind items and services
|
INJECTAFER | General | $28.06 |
| Otsuka America Pharmaceutical, Inc. |
Food and Beverage
In-kind items and services
|
REXULTI | General | $27.83 |
| Novo Nordisk Inc |
Food and Beverage
In-kind items and services
|
Rybelsus | General | $27.71 |
| Axsome Therapeutics, Inc. |
Food and Beverage
In-kind items and services
|
Auvelity | General | $26.87 |
| Pfizer Inc. |
Food and Beverage
In-kind items and services
|
NURTEC ODT | General | $26.62 |
| Indivior Inc. |
Food and Beverage
In-kind items and services
|
SUBLOCADE | General | $26.13 |
| Indivior Inc. |
Food and Beverage
In-kind items and services
|
SUBLOCADE | General | $25.70 |
| Otsuka America Pharmaceutical, Inc. |
Food and Beverage
In-kind items and services
|
REXULTI | General | $25.65 |
(top 25 shown)
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 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 – by Provider and Service data, 2017–2024; 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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J3111
Injection, romosozumab-aqqg, 1 mg
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22,051 | 23 | $15.89 | $10.89 |
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J0897
Injection, denosumab, 1 mg
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12,480 | 122 | $31.29 | $25.52 |
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J3304
Injection, triamcinolone acetonide, preservative-free, extended-release, microsphere formulation, 1 mg
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5,792 | 75 | $42.60 | $17.36 |
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J1010
Injection, methylprednisolone acetate, 1 mg
|
4,480 | 52 | $0.34 | $0.13 |
|
99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
|
3,721 | 1,285 | $161.24 | $91.39 |
|
36415
Insertion of needle into vein for collection of blood sample
|
2,026 | 1,098 | $17.39 | $8.59 |
|
83036
Hemoglobin a1c level
|
1,274 | 969 | $23.50 | $9.43 |
|
85025
Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count
|
1,212 | 986 | $29.20 | $7.60 |
|
80053
Blood test, comprehensive group of blood chemicals
|
1,189 | 985 | $44.94 | $10.33 |
|
80061
Blood test, lipids (cholesterol and triglycerides)
|
1,134 | 985 | $40.92 | $12.98 |
|
84443
Blood test, thyroid stimulating hormone (tsh)
|
1,007 | 930 | $74.28 | $16.43 |
|
82306
Vitamin d-3 level
|
960 | 922 | $72.37 | $28.76 |
|
82607
Cyanocobalamin (vitamin b-12) level
|
960 | 935 | $81.12 | $14.73 |
|
82746
Folic acid level, serum
|
932 | 920 | $81.16 | $14.38 |
|
J2250
Injection, midazolam hydrochloride, per 1 mg
|
863 | 142 | $1.43 | $0.13 |
|
86141
Measurement c-reactive protein for detection of infection or inflammation, high sensitivity
|
850 | 839 | $51.85 | $12.66 |
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G0439
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit
|
813 | 813 | $218.94 | $131.63 |
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81001
Manual urinalysis test with examination using microscope, automated
|
641 | 520 | $15.72 | $3.11 |
|
G0328
Colorectal cancer screening; fecal occult blood test, immunoassay, 1-3 simultaneous
|
501 | 501 | $29.48 | $17.69 |
|
81003
Automated urinalysis test
|
499 | 476 | $11.78 | $2.20 |
|
84403
Testosterone (hormone) level, total
|
481 | 465 | $53.78 | $25.17 |
|
84270
Sex hormone binding globulin (protein) level
|
472 | 463 | $27.53 | $21.22 |
|
G0008
Administration of influenza virus vaccine
|
459 | 449 | $49.23 | $32.84 |
|
90662
Influenza vaccine split virus, preservative free
|
450 | 440 | $138.34 | $79.88 |
|
96372
Injection of drug or substance under skin or into muscle
|
433 | 226 | $50.08 | $14.70 |
(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 |
|---|---|---|---|---|---|
| Rosuvastatin Calcium | Rosuvastatin Calcium | 1,563 | 136,688 | $27,608.41 | 455 |
| Levothyroxine Sodium | Levothyroxine Sodium | 756 | 62,643 | $11,260.85 | 204 |
| Amlodipine Besylate | Amlodipine Besylate | 728 | 63,242 | $4,694.52 | 225 |
| Atorvastatin Calcium | Atorvastatin Calcium | 689 | 59,684 | $6,762.07 | 227 |
| Olmesartan Medoxomil | Olmesartan Medoxomil | 634 | 54,081 | $16,016.60 | 192 |
| Mounjaro | Tirzepatide | 585 | 17,717 | $622,850.60 | 87 |
| Famotidine | Famotidine | 544 | 45,063 | $5,912.79 | 165 |
| Losartan Potassium | Losartan Potassium | 537 | 46,302 | $5,775.46 | 151 |
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 480 | 11,704 | $12,563.09 | 86 |
| Metformin Hcl | Metformin Hcl | 407 | 32,245 | $4,486.67 | 117 |
| Lisinopril | Lisinopril | 376 | 32,594 | $2,202.07 | 114 |
| Tramadol Hcl | Tramadol Hcl | 376 | 9,496 | $2,378.62 | 81 |
| Arexvy | Rsvpref3 Antigen/As01e/Pf | 365 | 3,932 | $114,052.44 | 364 |
| Pantoprazole Sodium | Pantoprazole Sodium | 318 | 24,247 | $4,450.52 | 104 |
| Gabapentin | Gabapentin | 306 | 15,958 | $5,881.55 | 71 |
| Tamsulosin Hcl | Tamsulosin Hcl | 293 | 23,886 | $5,713.49 | 87 |
| Escitalopram Oxalate | Escitalopram Oxalate | 290 | 22,944 | $3,844.56 | 95 |
| Metoprolol Succinate | Metoprolol Succinate | 272 | 23,165 | $4,368.10 | 81 |
| Furosemide | Furosemide | 269 | 19,163 | $1,233.66 | 83 |
| Pregabalin | Pregabalin | 259 | 8,574 | $5,501.03 | 48 |
| Carvedilol | Carvedilol | 240 | 16,596 | $2,116.31 | 60 |
| Eszopiclone | Eszopiclone | 239 | 9,051 | $5,715.63 | 52 |
| Trazodone Hcl | Trazodone Hcl | 233 | 17,289 | $1,939.31 | 68 |
| Montelukast Sodium | Montelukast Sodium | 213 | 17,665 | $3,200.36 | 59 |
| Hydrochlorothiazide | Hydrochlorothiazide | 203 | 16,642 | $660.64 | 60 |
(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
NUCC Taxonomy Code: 208D00000X
A physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - GENERAL PRACTICE
I20080710000694
CA
5092887869
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
Mangrove Medical Group
1040 Mangrove Ave, Chico, CA 959263509
Phone: 5303450064268
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Family Medicine
Doctor of Osteopathic Medicine (D.O.)
Obstetrics & Gynecology - Gynecology
Doctor of Medicine (M.D.)
Nurse Practitioner - Primary Care
Family Nurse Practitioner (Certified)
General Practice
Doctor of Medicine (M.D.), INC
Nurse Practitioner - Women's Health
Nurse Practitioner
General Practice
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated July 06, 2006.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other General Practices in Chico
- Dr. Amitabh Singh, DO
- Dr. Mark Schwab, MD
- Dr. Kurt Johnson, MD, INC
- Dr. Bradley Smith, MD
- Dr. Richard Brownley, MD
- Dr. Sergio Riffel, MD
Mailing Address
1040 Mangrove Ave
Chico, CA 959263509
Phone: 5303450064