Brian Peter First, M.D.
Internal Medicine Physician · San Diego, CA
Brian Peter First, M.D. is an internal medicine physician with a practice address in San Diego, California, and NPI 1770531816, issued on May 4, 2006. Check the license (California A33952, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Brian Peter First
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A33952 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4282 Genesee Ave, San Diego, CA 92117
- Phone
- (858) 292-0108
- Enumerated
- May 4, 2006
- Record last updated
- Jun 24, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (858) 292-9097
- Medicare enrollment
- Enrolled (PECOS I20050726000741); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
Also registered at 4282 Genesee Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alison Anthony, CFNPAdult Health Nurse Practitioner1114071438
- Taylor Chute, M.S.Pediatric Occupational Therapist1003708587
- Shirley Fett, CFNPNurse Practitioner1316091622
- Natasha Fischang, AU.D.Audiologist1477855989
- Kathleen Grichar, AU.D.Audiologist-Hearing Aid Fitter1366791691
- Emily Kirkpatrick, SLPSpeech-Language Pathologist1437933272
Verify Brian Peter First in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A33952Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.6 times the Medicare Part D claims of the average internal medicine physician in 2024
8,160 Medicare Part D claims for 688 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims. 200 claims were for opioids.
Most prescribed
- Levothyroxine Sodium499 claims
- Atorvastatin Calcium427 claims
- Metformin Hcl312 claims
- Amlodipine Besylate237 claims
- Losartan Potassium202 claims
- Montelukast Sodium193 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): 11.4 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: $2,673.52
127 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Ritchken And First Medical GroupSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
961 internal medicine physician records list a practice address in San Diego
They are 961 of the 52,937 NPPES records with a practice address in San Diego, and 17,696 internal medicine physician records in California.
All 961 in San Diego → All 17,696 in California → Every provider in San Diego →
Other internal medicine physician records in California
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- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Brian Peter First, M.D.'s NPI number?
Brian Peter First, M.D.'s National Provider Identifier (NPI) is 1770531816, issued on May 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Brian Peter First, M.D. located?
The NPPES record lists a practice address at 4282 Genesee Ave, San Diego, CA, 92117. Phone: (858) 292-0108. Providers update this record themselves, so call before visiting.
How can I verify Brian Peter First, M.D.'s license?
NPPES lists California license number A33952, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Brian Peter First, M.D. prescribe under Medicare Part D?
In 2024, Brian Peter First, M.D. had 8,160 Medicare Part D claims for 688 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Brian Peter First, M.D.'s MIPS final score?
The 2023 MIPS final score is 11.4 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.