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

Summaiya Muhammad, M.D

Hospitalist Physician in Castro Valley, CA · enumerated 2008.

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

National Provider Identifier

1841454535

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Registry record

Entity type Individual (Type 1)

Name Summaiya Muhammad

Credential M.D

Sex Female

Practice address Castro Valley, CA, 94546

Phone (510) 727-3256

Enumeration date Jul 11, 2008

Last updated in NPPES May 9, 2017

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

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 125052361 (IL) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License A117252 (CA) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License A117252 (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
A117252	Other	CA	STATE 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 1841454535 active?

Yes, as of the latest NPPES snapshot, NPI 1841454535 is active (record last updated 2017-05-09).

How do I verify Summaiya Muhammad's NPI record?

Cross-check NPI 1841454535 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-05-09.