Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Marcia C Peck, MD

Endocrinology, Diabetes & Metabolism Physician in Castro Valley, CA · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1376569475

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Marcia C Peck

Credential MD

Sex Female

Practice address Castro Valley, CA, 94546

Phone (510) 204-2574

Fax (510) 886-8466

Enumeration date Jul 14, 2006

Last updated in NPPES Mar 11, 2011

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207RE0101X Endocrinology, Diabetes & Metabolism Physician Allopathic & Osteopathic Physicians · License A75655 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
A75655	Other	CA	MEDICAL LICENSE

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1376569475 active?

Yes, as of the latest NPPES snapshot, NPI 1376569475 is active (record last updated 2011-03-11).

How do I verify Marcia Peck's NPI record?

Cross-check NPI 1376569475 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-03-11.