Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Mark M Macelwee, M.D.

Hospitalist Physician in Phoenix, AZ · enumerated 2005.

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

National Provider Identifier

1437133378

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Registry record

Entity type Individual (Type 1)

Name Mr. Mark M Macelwee

Credential M.D.

Sex Male

Practice address 2525 E Roosevelt St, Phoenix, AZ, 85008

Phone (602) 344-1119

Fax (602) 344-1112

Enumeration date Dec 5, 2005

Last updated in NPPES Jul 23, 2018

Taxonomy & licenses

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License DR40558 (CO) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 26806 (AZ) 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
455643	Medicaid	AZ	-
56488521	Medicaid	CO	-
P00172747	Other	AZ	RAILROAD MEDICARE
86080015085259A966	Other	AZ	TRIWEST

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Mark Macelwee?

The National Provider Identifier (NPI) for Mark Macelwee is 1437133378, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Macelwee practice?

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

Other providers at this practice address

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Surabhi Amar Hematology & Oncology Physician · Phoenix, AZ NPI 1083698955 John Peachey Obstetrics & Gynecology Physician · Phoenix, AZ NPI 1255384780 Salil Pradhan Pediatrics Physician · Phoenix, AZ NPI 1013960558 Joseph Hanss Obstetrics & Gynecology Physician · Phoenix, AZ NPI 1902859945 Teresa Buckstein Pediatrics Physician · Phoenix, AZ NPI 1255384111 Jose Deguzman Urology Physician · Phoenix, AZ NPI 1477507697 Gael Derouin Otolaryngology Physician · Phoenix, AZ NPI 1821042078 Gary Russell Physician Assistant · Phoenix, AZ NPI 1437103306

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-07-23.