NPPES file of Aug 9, 2026

Carl Grunfeld, M.D.

Endocrinology, Diabetes & Metabolism Physician · San Francisco, CA

Carl Grunfeld, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in San Francisco, California, and NPI 1659487635, issued on Aug 22, 2006. Check the license (California G41853, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1659487635
Name
Carl Grunfeld
Credential
M.D.
Primary taxonomy
Endocrinology, Diabetes & Metabolism Physician 207RE0101X
License number
G41853 CA
Self-reported in NPPES; status is on the state search
Practice location
4150 Clement St, San Francisco, CA 94121
Phone
(415) 750-2005
Enumerated
Aug 22, 2006
Record last updated
Jul 12, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(415) 750-6927
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
Download card Updates feed

8 nearest endocrinology, diabetes & metabolism physician records → All 1,131 in California → Look up another NPI →

Also registered at 4150 Clement St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Samantha Abram, BAPsychologist1326540436
  2. Gary Abrams, M.D.Physical Medicine & Rehabilitation Physician1346213246
  3. Anna Abramson, M.D.Internal Medicine Physician1346424785
  4. Alison Acerra, MS, RDRegistered Dietitian1992726848
  5. Sharon AdelsonCounselor1932467271
  6. Gary Agcaoili, C.T.R.SRecreation Therapist1649284019

Verify Carl Grunfeld in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G41853    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

Is this page about you? You can ask us to correct, restrict or remove it: how.

Carl Grunfeld among 1,131 endocrinology, diabetes & metabolism physician records in California

Carl Grunfeld, M.D. is one of 1,131 endocrinology, diabetes & metabolism physician records with a practice address in California. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 5% of them.

  • NPI issued2006 · 5% of these records are older, 54% newer
  • In a Medicare fileNo · 84% of these records are
  • In the CMS Doctors and Clinicians fileNo · 69% of these records are
  • Record last updated2007 · 57% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Endocrinology, Diabetes & Metabolism Physician providers in California

There are 1,131 endocrinology, diabetes & metabolism physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 1,131 in California → Every provider in San Francisco → Endocrinology, Diabetes & Metabolism Physician nationwide →

The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes

  1. Daniel Bikle, MDSan Francisco, CA 941211669588760
  2. Edward Hsiao, M.D., PH.D.San Francisco, CA 941211750316030
  3. Karin Wu, MDSan Francisco, CA 941211043639040
  4. Steven Snyder, M.DSan Francisco, CA 941231326125980
  5. Philip Frost, M.DSan Francisco, CA 941181912905928
  6. Nathan Becker, M.D.San Francisco, CA 941171972696250
  7. Eric Buxton, M.D.San Francisco, CA 941171134210362
  8. Paul Fitzgerald, M.D.San Francisco, CA 941171326356460

Common questions

What is Carl Grunfeld, M.D.'s NPI number?

Carl Grunfeld, M.D.'s National Provider Identifier (NPI) is 1659487635, issued on Aug 22, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Carl Grunfeld, M.D. located?

The NPPES record lists a practice address at 4150 Clement St, San Francisco, CA, 94121. Phone: (415) 750-2005. Providers update this record themselves, so call before visiting.

How can I verify Carl Grunfeld, M.D.'s license?

NPPES lists California license number G41853, 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.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.