Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. C William Riedel, D.O.

Obstetrics & Gynecology Physician in Allentown, PA · enumerated 2005.

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

National Provider Identifier

1629066923

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Registry record

Entity type Individual (Type 1)

Name Dr. C William Riedel

Credential D.O.

Sex Male

Practice address 1941 W Hamilton St, Suite 100, Allentown, PA, 18104

Phone (610) 432-4665

Fax (610) 432-8512

Enumeration date Oct 11, 2005

Last updated in NPPES May 13, 2024

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License OS009291L (PA) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
0017558430005	Medicaid	PA	-
026537	Other	PA	MEDICARE GROUP B

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.

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Frequently asked questions

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.

What specialty is C Riedel?

C Riedel is registered in NPPES with the primary taxonomy of Obstetrics & Gynecology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

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Hamilton Obstetrics & Gynecology,P.C. Obstetrics & Gynecology Physician · Allentown, PA NPI 1538123195 Denise Stein Nurse Practitioner · Allentown, PA NPI 1861431033 Scott Stein Medical Physician Assistant · Allentown, PA NPI 1790716256 Primary Care Associates in the Lehigh Valley, P.C. Internal Medicine Physician · Allentown, PA NPI 1205866977 Matthew Nussbaum Family Medicine Physician · Allentown, PA NPI 1356548978 Kate Bierce Medical Physician Assistant · Allentown, PA NPI 1154639284

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-05-13.