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

Dr. William Clark Decker, D.O.

Pulmonary Disease Physician in Adrian, MI · enumerated 2005.

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

National Provider Identifier

1942205208

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Registry record

Entity type Individual (Type 1)

Name Dr. William Clark Decker

Credential D.O.

Sex Male

Practice address Adrian, MI, 49221

Phone (517) 265-3411

Fax (517) 263-7694

Enumeration date Jun 14, 2005

Last updated in NPPES Nov 3, 2023

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

Taxonomy & licenses

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 5101009355 (MI) Secondary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 34.008398 (OH) Secondary

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License 34.008398 (OH) Secondary

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License 5101009355 (MI) 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
03877	Other	MI	PARAMOUNT HEALTHCARE
1154600085	Other	MI	BCBSM
2032884	Medicaid	OH	-
2649747	Medicaid	MI	-

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

How do I verify William Decker's NPI record?

Cross-check NPI 1942205208 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1942205208 active?

Yes, as of the latest NPPES snapshot, NPI 1942205208 is active (record last updated 2023-11-03).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-11-03.