Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Kirsten Piening Marcus, M.D.

Internal Medicine Physician in San Francisco, CA · enumerated 2007.

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

National Provider Identifier

1992995435

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Kirsten Piening Marcus

Credential M.D.

Sex Female

Practice address 840 Irving St, San Francisco, CA, 94122

Phone (415) 590-6140

Fax (415) 291-0489

Enumeration date Jul 31, 2007

Last updated in NPPES Feb 5, 2018

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 045703 (CT) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 127636 (CA) Primary

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

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

Where does Kirsten Marcus practice?

The practice location on file with NPPES is in San Francisco, CA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Kirsten Marcus?

The National Provider Identifier (NPI) for Kirsten Marcus is 1992995435, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-02-05.