Gregory S. Baker , PA-C
Physician Assistant • Bakersfield, CA
1925 17th St
Bakersfield, CA 933014201
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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NPI assigned on October 11, 2006; this date does not establish years in practice.
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Published CMS data list 2,726 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:
- 99214 — Established patient outpatient office visit: 815 service units.
- 99215 — Established patient outpatient office visit: 566 service units.
- 99443 — Telephone medical discussion with physician: 433 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.
CPT® 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 21 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 10,827 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:
- Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) — 538 prescription fills, including refills.
- Atorvastatin Calcium — 467 prescription fills, including refills.
- Amlodipine Besylate — 354 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 167 records in the table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 85% of clinicians listed under Physician Assistant in Bakersfield, CA (2024, 71 clinicians with data). Median for this group: 347. Middle half: 82 to 1,242.
More Medicare Part B services than 90% of clinicians listed under Physician Assistant in California (2024, 4,833 clinicians with data). Median for this group: 198. Middle half: 71 to 535.
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 3,900 in 2020 to 2,726 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
1925 17th St
Bakersfield, CA 933014201
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: Ronnie Claiborne Md A Professional Corporation. 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
1996
What Public CMS Data Show
Physician Assistant: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
389 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 $273,647 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 $197,646 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
14,778 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
$1,075,277 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: $4,212.16 across 187 records.
By nature of payment
- Food and Beverage: $4,120.91 across 186 records.
- Education: $91.25 across 1 record.
Reporting-company totals (3 largest of 29)
- Teva Pharmaceuticals USA, Inc.: $642.10 across 19 records.
- ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.): $572.81 across 17 records.
- AstraZeneca Pharmaceuticals LP: $334.42 across 14 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
30 years (graduated 1996)
CMS Doctors and Clinicians data list 1996 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)
Gregory Baker 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 Gregory Baker 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 Bakersfield and California
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 85% of clinicians listed under Physician Assistant in Bakersfield, CA (2024, 71 clinicians with data). Median for this group: 347. Middle half: 82 to 1,242.
More Medicare Part B services than 90% of clinicians listed under Physician Assistant in California (2024, 4,833 clinicians with data). Median for this group: 198. Middle half: 71 to 535.
Medicare-allowed amount
A higher Medicare-allowed amount than 95% of clinicians listed under Physician Assistant in Bakersfield, CA (2024, 71 clinicians with data). Median for this group: $26,948. Middle half: $8,134 to $79,489.
A higher Medicare-allowed amount than 95% of clinicians listed under Physician Assistant in California (2024, 4,833 clinicians with data). Median for this group: $18,173. Middle half: $6,666 to $41,587.
Paid by Medicare
A higher Medicare payment amount than 95% of clinicians listed under Physician Assistant in Bakersfield, CA (2024, 71 clinicians with data). Median for this group: $18,490. Middle half: $5,956 to $57,466.
A higher Medicare payment amount than 95% of clinicians listed under Physician Assistant in California (2024, 4,833 clinicians with data). Median for this group: $13,209. Middle half: $4,792 to $30,879.
Medicare Part D prescriptions
More Part D prescriptions than 95% of clinicians listed under Physician Assistant in Bakersfield, CA (2024, 98 clinicians with data). Median for this group: 464. Middle half: 127 to 1,606.
More Part D prescriptions than 95% of clinicians listed under Physician Assistant in California (2024, 7,516 clinicians with data). Median for this group: 229. Middle half: 72 to 718.
Part D drug cost
A higher Part D drug cost than 95% of clinicians listed under Physician Assistant in Bakersfield, CA (2024, 98 clinicians with data). Median for this group: $7,263. Middle half: $1,184 to $116,284.
A higher Part D drug cost than 95% of clinicians listed under Physician Assistant in California (2024, 7,516 clinicians with data). Median for this group: $3,945. Middle half: $709 to $60,209.
165 active clinicians are listed under Physician Assistant with a practice address in Bakersfield, CA (14,458 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Bakersfield
11.5% of these 165 clinicians have the CMS telehealth indicator.
47.3% of these 165 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 decreased 30% from 3,900 in 2020 to 2,726 in 2024.
- 2020: 3,900
- 2021: 3,127
- 2022: 2,850
- 2023: 2,650
- 2024: 2,726
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Medicare-allowed amount
Medicare-allowed amount stayed about the same: $297,355 in 2020 and $273,647 in 2024.
- 2020: $297,355
- 2021: $310,071
- 2022: $262,136
- 2023: $252,208
- 2024: $273,647
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Paid by Medicare
Paid by Medicare stayed about the same: $213,178 in 2020 and $197,646 in 2024.
- 2020: $213,178
- 2021: $234,518
- 2022: $184,302
- 2023: $182,540
- 2024: $197,646
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 25% from 14,398 in 2020 to 10,827 in 2024.
- 2020: 14,398
- 2021: 10,957
- 2022: 10,593
- 2023: 10,098
- 2024: 10,827
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30-day fills
30-day fills decreased 19% from 18,291 in 2020 to 14,778 in 2024.
- 2020: 18,291
- 2021: 14,530
- 2022: 14,712
- 2023: 14,127
- 2024: 14,778
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Part D drug cost
Part D drug cost varied from year to year: $1,167,982 in 2020 and $1,075,277 in 2024.
- 2020: $1,167,982
- 2021: $1,009,342
- 2022: $1,314,828
- 2023: $1,273,014
- 2024: $1,075,277
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Industry payments (Open Payments)
Industry payments (Open Payments) decreased 16% from $5,003.17 in 2021 to $4,212.16 in 2025.
- 2021: $5,003.17
- 2022: $3,126.89
- 2023: $4,097.55
- 2024: $3,428.05
- 2025: $4,212.16
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): 187 records totaling $4,212.16.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) |
Food and Beverage
In-kind items and services
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CAPLYTA | General | $126.61 |
| Pfizer Inc. |
Food and Beverage
In-kind items and services
|
NURTEC ODT | General | $125.00 |
| Teva Pharmaceuticals USA, Inc. |
Food and Beverage
In-kind items and services
|
UZEDY | General | $125.00 |
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) |
Food and Beverage
In-kind items and services
|
CAPLYTA | General | $124.89 |
| Teva Pharmaceuticals USA, Inc. |
Food and Beverage
In-kind items and services
|
UZEDY | General | $113.62 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
|
Repatha | General | $111.50 |
| Otsuka America Pharmaceutical, Inc. |
Food and Beverage
In-kind items and services
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REXULTI | General | $110.00 |
| Bristol Myers Squibb Company |
Food and Beverage
Cash or cash equivalent
|
CAMZYOS | General | $109.96 |
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) |
Food and Beverage
In-kind items and services
|
CAPLYTA | General | $109.01 |
| Astellas Pharma US Inc |
Food and Beverage
In-kind items and services
|
Cresemba | General | $109.01 |
| Teva Pharmaceuticals USA, Inc. |
Food and Beverage
In-kind items and services
|
UZEDY | General | $108.33 |
| Teva Pharmaceuticals USA, Inc. |
Education
In-kind items and services
|
— | General | $91.25 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
|
FARXIGA | General | $63.40 |
| Corcept Therapeutics |
Food and Beverage
In-kind items and services
|
Korlym | General | $34.54 |
| Lundbeck LLC |
Food and Beverage
Cash or cash equivalent
|
ABILIFY ASIMTUFII | General | $32.21 |
| Viatris Specialty LLC |
Food and Beverage
In-kind items and services
|
YUPELRI | General | $31.40 |
| Corcept Therapeutics |
Food and Beverage
In-kind items and services
|
Korlym | General | $30.34 |
| Pfizer Inc. |
Food and Beverage
In-kind items and services
|
ELIQUIS | General | $29.91 |
| Astellas Pharma US Inc |
Food and Beverage
In-kind items and services
|
Veozah | General | $29.81 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
|
WAINUA | General | $29.50 |
| Grifols Shared Services North America, Inc. |
Food and Beverage
In-kind items and services
|
Prolastin-C Liquid | General | $28.69 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
|
WAINUA | General | $28.38 |
| Phathom Pharmaceuticals, Inc. |
Food and Beverage
Cash or cash equivalent
|
VOQUEZNA | General | $28.14 |
| AstraZeneca Pharmaceuticals LP |
Food and Beverage
In-kind items and services
|
WAINUA | General | $28.02 |
| Teva Pharmaceuticals USA, Inc. |
Food and Beverage
In-kind items and services
|
UZEDY | General | $27.95 |
(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 |
|---|---|---|---|---|
|
99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
|
815 | 295 | $161.32 | $109.65 |
|
99215
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
|
566 | 230 | $218.96 | $153.15 |
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99443
Telephone medical discussion with physician, 21-30 minutes
|
433 | 205 | $160.00 | $110.63 |
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99442
Telephone medical discussion with physician, 11-20 minutes
|
341 | 194 | $119.99 | $78.19 |
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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
|
87 | 74 | $118.16 | $75.47 |
|
96372
Injection of drug or substance under skin or into muscle
|
60 | 49 | $35.58 | $12.25 |
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99441
Telephone medical discussion with physician, 5-10 minutes
|
52 | 47 | $80.00 | $48.92 |
|
93000
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report
|
50 | 48 | $40.00 | $12.42 |
|
99490
Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month
|
42 | 15 | $68.21 | $53.88 |
|
J1100
Injection, dexamethasone sodium phosphate, 1 mg
|
38 | 35 | $12.00 | $0.11 |
|
80305
Testing for presence of drug, read by direct observation
|
31 | 28 | $25.00 | $11.30 |
|
G0439
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit
|
29 | 29 | $150.00 | $111.97 |
|
94200
Test to measure largest amount of air breathed in an out
|
27 | 23 | $35.00 | $13.25 |
|
81003
Automated urinalysis test
|
26 | 24 | $15.00 | $2.20 |
|
82947
Blood glucose (sugar) level
|
23 | 21 | $15.00 | $3.85 |
|
20610
Aspiration and/or injection of fluid from large joint
|
22 | 19 | $95.14 | $54.57 |
|
99205
New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more
|
21 | 21 | $250.00 | $189.33 |
|
99212
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more
|
20 | 19 | $80.00 | $49.13 |
|
J1885
Injection, ketorolac tromethamine, per 15 mg
|
16 | 14 | $60.00 | $0.67 |
|
J3420
Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg
|
14 | 11 | $20.00 | $1.24 |
|
J3301
Injection, triamcinolone acetonide, not otherwise specified, 10 mg
|
13 | 11 | $20.00 | $0.96 |
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 |
|---|---|---|---|---|---|
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 538 | 15,058 | $10,616.43 | 83 |
| Atorvastatin Calcium | Atorvastatin Calcium | 467 | 23,935 | $2,169.56 | 110 |
| Amlodipine Besylate | Amlodipine Besylate | 354 | 17,480 | $1,280.62 | 90 |
| Levothyroxine Sodium | Levothyroxine Sodium | 346 | 18,004 | $2,981.07 | 80 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 309 | 6,491 | $10,629.36 | 76 |
| Pantoprazole Sodium | Pantoprazole Sodium | 271 | 10,851 | $1,719.65 | 58 |
| Lisinopril | Lisinopril | 245 | 13,768 | $1,338.65 | 62 |
| Metformin Hcl Er | Metformin Hcl | 208 | 9,112 | $912.67 | 47 |
| Gabapentin | Gabapentin | 195 | 7,032 | $2,375.33 | 40 |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 191 | 10,368 | $2,734.96 | 51 |
| Potassium Chloride | Potassium Chloride | 190 | 7,770 | $2,224.83 | 59 |
| Alprazolam | Alprazolam | 180 | 5,301 | $1,432.16 | 36 |
| Olmesartan Medoxomil | Olmesartan Medoxomil | 179 | 7,474 | $1,214.19 | 37 |
| Omeprazole | Omeprazole | 172 | 8,415 | $948.95 | 39 |
| Atenolol | Atenolol | 160 | 7,530 | $705.44 | 37 |
| Celecoxib | Celecoxib | 160 | 5,692 | $3,575.64 | 43 |
| Zolpidem Tartrate | Zolpidem Tartrate | 154 | 4,799 | $717.86 | 31 |
| Ibuprofen | Ibuprofen | 150 | 4,431 | $633.30 | 43 |
| Hydrochlorothiazide | Hydrochlorothiazide | 143 | 7,888 | $270.46 | 43 |
| Furosemide | Furosemide | 141 | 6,208 | $391.68 | 47 |
| Tamsulosin Hcl | Tamsulosin Hcl | 130 | 6,122 | $1,510.95 | 33 |
| Ozempic | Semaglutide | 125 | 4,108 | $125,429.77 | 28 |
| Cyclobenzaprine Hcl | Cyclobenzaprine Hcl | 115 | 3,315 | $940.01 | 26 |
| Metformin Hcl | Metformin Hcl | 114 | 5,694 | $317.28 | 28 |
| Metoprolol Succinate | Metoprolol Succinate | 111 | 5,964 | $1,573.49 | 28 |
(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: 363A00000X
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - PHYSICIAN ASSISTANT
I20130328000111
CA
6002051836
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
Ronnie Claiborne Md A Professional Corporation
1925 17th St, Bakersfield, CA 933014201
Phone: 6613232295
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
General Practice
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated October 11, 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 Physician Assistants in Bakersfield
- Sandra Casillas
- Anamika Shukla, PA
- Anita Garrett, PA-C
- Virginia Gifford, NP
- Caroline Moser, PA-C
- Sanggitha Ramirez, PA-C
Mailing Address
11698 Snow Rd
Bakersfield, CA 933148759
Phone: 6613871213