Kathleen M. Grannan, MD
Internal Medicine Physician · Oakland, CA
Kathleen M. Grannan, MD is an internal medicine physician with a practice address in Oakland, California, and NPI 1538245063, issued on Oct 27, 2006. Check the license (California G55007, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Kathleen M. Grannan
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G55007 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1950 Franklin St, Oakland, CA 94612
- Phone
- (510) 987-1000
- Enumerated
- Oct 27, 2006
- Record last updated
- Nov 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00G550070 CA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1950 Franklin St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Kathleen M. Grannan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G55007Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average internal medicine physician in 2024
11 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
Kathleen M. Grannan among 17,696 internal medicine physician records in California
Kathleen M. Grannan, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% 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, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2021 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
432 internal medicine physician records list a practice address in Oakland
They are 432 of the 18,558 NPPES records with a practice address in Oakland, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Oakland → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ameena Ahmed, MDOakland, CA 946121700962230
- Andrew Avins, M.D.Oakland, CA 946121346354792
- Ronald Chun, M.D.Oakland, CA 946121730162264
- Tri Do, MDOakland, CA 946121053402651
- Susan Fernyak, MDOakland, CA 946121679688014
- Alan Go, MDOakland, CA 946121184700619
- Coleman GrossOakland, CA 946121538193388
- John Hirshleifer, M.DOakland, CA 946121407893621
Common questions
What is Kathleen M. Grannan, MD's NPI number?
Kathleen M. Grannan, MD's National Provider Identifier (NPI) is 1538245063, issued on Oct 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Kathleen M. Grannan, MD located?
The NPPES record lists a practice address at 1950 Franklin St, Oakland, CA, 94612. Phone: (510) 987-1000. Providers update this record themselves, so call before visiting.
How can I verify Kathleen M. Grannan, MD's license?
NPPES lists California license number G55007, 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 Kathleen M. Grannan, MD prescribe under Medicare Part D?
In 2024, Kathleen M. Grannan, MD had 11 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. 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.