NPI Portal NPI Lookup & Verification

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

Warren Bradley Fields, M.D.

Pulmonary Disease Physician in Royal Oak, MI · enumerated 2007.

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

National Provider Identifier

1225158694

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Registry record

Entity type Individual (Type 1)
Name Warren Bradley Fields
Credential M.D.
Sex Male
Practice address Royal Oak, MI, 48073
Phone (248) 548-2114
Fax (248) 548-2135
Enumeration date Mar 30, 2007
Last updated in NPPES Sep 12, 2024

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 4301076558 (MI) Secondary
207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 036121035 (IL) Secondary
207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License 036121035 (IL) Secondary
207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License 4301076558 (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
P00707900 Other IL MEDICARE RAILROAD
036121035 Medicaid IL -

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 Warren Fields's NPI record?
Cross-check NPI 1225158694 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1225158694 active?
Yes, as of the latest NPPES snapshot, NPI 1225158694 is active (record last updated 2024-09-12).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-09-12.