Gregory Sean Hadfield, PA-C
Physician Assistant · Lakeport, CA
Gregory Sean Hadfield, PA-C is a physician assistant with a practice address in Lakeport, California, and NPI 1285869966, issued on May 24, 2009. Check the license (California P-16311, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gregory Sean Hadfield
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- P-16311 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5144 Hill RD E, Lakeport, CA 95453
- Phone
- (707) 263-8955
- Enumerated
- May 24, 2009
- Record last updated
- May 24, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (707) 263-8340
- Medicare enrollment
- Enrolled (PECOS I20100304000262); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Also registered at 5144 Hill RD E
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kinston Cummings, PAPhysician Assistant1295462778
- Megan Furniss, D.O.Dermatology Physician1528359577
- Christine Goold, FNP/PA-CPhysician Assistant1184679300
- James Kahn, MDDermatology Physician1316030224
- Diana Riley, M.P.H., M.S.,P.A.-C.Physician Assistant1730386046
Verify Gregory Sean Hadfield in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license P-16311Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.7 times the Medicare Part D claims of the average physician assistant in 2024
2,238 Medicare Part D claims for 599 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D.
Most prescribed
- Ketoconazole394 claims
- Mupirocin327 claims
- Triamcinolone Acetonide289 claims
- Clobetasol Propionate106 claims
- Cephalexin101 claims
- Hydrocortisone89 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 0 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $396.52
16 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 64,719 providers of this specialty with any payment received $841.65 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Eye Associates OF Sebastopol Medical GroupClearlake, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Sean Hadfield among 14,451 physician assistant records in California
Gregory Sean Hadfield, PA-C is one of 14,451 physician assistant records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 25% of them.
- NPI issued2009 · 25% of these records are older, 73% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2001 · median 2018 among the 7,214 with a school on file
- Record last updated2009 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
11 physician assistant records list a practice address in Lakeport
They are 11 of the 375 NPPES records with a practice address in Lakeport, and 14,451 physician assistant records in California.
All 14,451 in California → Every provider in Lakeport → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Kinston Cummings, PALakeport, CA 954531295462778
- Jayla Flaum, PA-CLakeport, CA 954531043889470
- Christine Goold, FNP/PA-CLakeport, CA 954531184679300
- Sofia KenneallyLakeport, CA 954531528718327
- Kimberly Kirschner, PA-CLakeport, CA 954531194567727
- Jaques Ngakam, PALakeport, CA 954531194254995
- Diana Riley, M.P.H., M.S.,P.A.-C.Lakeport, CA 954531730386046
- Shayaan SajidLakeport, CA 954531396468435
Common questions
What is Gregory Sean Hadfield, PA-C's NPI number?
Gregory Sean Hadfield, PA-C's National Provider Identifier (NPI) is 1285869966, issued on May 24, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Sean Hadfield, PA-C located?
The NPPES record lists a practice address at 5144 Hill RD E, Lakeport, CA, 95453. Phone: (707) 263-8955. Providers update this record themselves, so call before visiting.
How can I verify Gregory Sean Hadfield, PA-C's license?
NPPES lists California license number P-16311, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Gregory Sean Hadfield, PA-C prescribe under Medicare Part D?
In 2024, Gregory Sean Hadfield, PA-C had 2,238 Medicare Part D claims for 599 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
What is Gregory Sean Hadfield, PA-C's MIPS final score?
The 2023 MIPS final score is 0 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.