Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William C Chapman Jr., MD

Colon & Rectal Surgery Physician in Saint Louis, MO · enumerated 2015 · practices at Washington University.

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

National Provider Identifier

1003297177

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Registry record

Entity type Individual (Type 1)

Name Dr. William C Chapman Jr.

Credential MD

Sex Male

Practice address 1044 N Mason Rd, Div Surg Colon/Rectal, Ste 310, Saint Louis, MO, 63141

Phone (314) 454-7177

Fax (888) 425-7946

Enumeration date Jun 15, 2015

Last updated in NPPES Apr 15, 2025

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 2017007784 (MO) Secondary

208C00000X Colon & Rectal Surgery Physician Allopathic & Osteopathic Physicians · License 2017007784 (MO) 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
200044671	Medicaid	MO	-

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

Where does William Chapman practice?

The practice location on file with NPPES is in Saint Louis, MO. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for William Chapman?

The National Provider Identifier (NPI) for William Chapman is 1003297177, a Type 1 (individual) record in the CMS NPPES registry.

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Scott Starenchak General Practice Physician · Saint Louis, MO NPI 1356338107 Veronica Kim Endocrinology, Diabetes & Metabolism Physician · Saint Louis, MO NPI 1710949458 Hani Soudah Endocrinology, Diabetes & Metabolism Physician · Saint Louis, MO NPI 1811935471 Jay Piccirillo Otolaryngology Physician · Creve Coeur, MO NPI 1124059647 Megan Wren Internal Medicine Physician · Saint Louis, MO NPI 1306862610 Matthew Mutch Colon & Rectal Surgery Physician · Saint Louis, MO NPI 1669498887 Margaret Wallace Family Nurse Practitioner · Creve Coeur, MO NPI 1689691115 John Eagon Surgery Physician · Saint Louis, MO NPI 1801814538

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-04-15.