Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John William Chatas, MD

Interventional Pain Medicine Physician in Ann Arbor, MI · enumerated 2006.

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

National Provider Identifier

1083710107

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Registry record

Entity type Individual (Type 1)

Name Dr. John William Chatas

Credential MD

Sex Male

Practice address 710 Avis Dr Ste 200, Ann Arbor, MI, 48108

Phone (734) 373-7246

Fax (734) 375-6585

Enumeration date Sep 16, 2006

Last updated in NPPES Feb 25, 2025

Taxonomy & licenses

207L00000X Anesthesiology Physician Allopathic & Osteopathic Physicians · License 4301051247 (MI) Secondary

208VP0014X Interventional Pain Medicine Physician Allopathic & Osteopathic Physicians · License 4301051247 (MI) 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
1589691	Other	MI	UNITED HEALTHCARE NO
4591478	Other	MI	AETNA INDIVIDUAL NO
0813502	Other	MI	BCBS OF MI PIN

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 John Chatas?

John Chatas is registered in NPPES with the primary taxonomy of Interventional Pain Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-02-25.