Teresa Lynn Diaz, MD
Obstetrics & Gynecology Physician · Oakland, CA
Teresa Lynn Diaz, MD is an obstetrics & gynecology physician with a practice address in Oakland, California, and NPI 1194735753, issued on Aug 8, 2006. Check the license (California A88588, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Teresa Lynn Diaz
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A88588 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1411 E 31St Street, Oakland, CA 94602
- Phone
- (510) 437-4323
- Enumerated
- Aug 8, 2006
- Record last updated
- Feb 21, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (510) 437-5042
- Medicaid ID
- 00A885880 CA
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 1411 E 31St Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Sharon Abram, LCSWClinical Social Worker1467632265
- Ronald Adler, MDGastroenterology Physician1134206162
- Kristina Barrientos, MDStudent in an Organized Health Care Education/Training Program1891490579
- Lyn Berry, MDInternal Medicine Physician1528078193
- Johara Chapman, MDObstetrics & Gynecology Physician1447260021
- Kathleen Clanon, MDAllergy & Immunology Physician1386654945
Verify Teresa Lynn Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A88588Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
31% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
114 Medicare Part D claims for 19 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Most prescribed
- Liothyronine Sodium28 claims
- Progesterone21 claims
- Levothyroxine Sodium17 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.
Teresa Lynn Diaz among 5,088 obstetrics & gynecology physician records in California
Teresa Lynn Diaz, MD is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2012 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Oakland → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Jessica Beckerman, MDOakland, CA 946021992123962
- Johara Chapman, MDOakland, CA 946021447260021
- Bonnie Flemming, MDOakland, CA 946021356351936
- Phillip Gorrindo, M.D., PH.D.Oakland, CA 946021831517937
- Leia Harbour, MDOakland, CA 946021942620919
- Stephanie HoOakland, CA 946021124406608
- Frazier Hubbard, MDOakland, CA 946021891705489
- Arthur Levit, MDOakland, CA 946021669550455
Common questions
What is Teresa Lynn Diaz, MD's NPI number?
Teresa Lynn Diaz, MD's National Provider Identifier (NPI) is 1194735753, issued on Aug 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Teresa Lynn Diaz, MD located?
The NPPES record lists a practice address at 1411 E 31St Street, Oakland, CA, 94602. Phone: (510) 437-4323. Providers update this record themselves, so call before visiting.
How can I verify Teresa Lynn Diaz, MD's license?
NPPES lists California license number A88588, 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 Teresa Lynn Diaz, MD prescribe under Medicare Part D?
In 2024, Teresa Lynn Diaz, MD had 114 Medicare Part D claims for 19 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
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.