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

Dr. Mark Gary Singer, M. D.

General Practice Physician in Pontiac, MI · enumerated 2007.

Data current as of Jul 11, 2026 · sourced from CMS NPPES

National Provider Identifier

1831308782

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Gary Singer

Credential M. D.

Sex Male

Practice address Pontiac, MI, 48340

Phone (248) 857-0599

Fax (248) 857-8946

Enumeration date May 21, 2007

Last updated in NPPES Mar 7, 2012

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

Taxonomy & licenses

2083X0100X Occupational Medicine Physician Allopathic & Osteopathic Physicians · License 4301069704 (MI) Secondary

208D00000X General Practice Physician Allopathic & Osteopathic Physicians · License 4301069704 (MI) 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

What specialty is Mark Singer?

Mark Singer is registered in NPPES with the primary taxonomy of General Practice Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2012-03-07.