Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Arnold Altman, MD

Pediatric Hematology & Oncology Physician in Hartford, CT · enumerated 2006.

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

National Provider Identifier

1376515239

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Registry record

Entity type Individual (Type 1)

Name Arnold Altman

Credential MD

Sex Male

Practice address 282 Washington St, Hartford, CT, 06106

Phone (860) 545-9630

Fax (860) 545-9622

Enumeration date Feb 6, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

2080P0207X Pediatric Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 016543 (CT) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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

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 Arnold Altman?

Arnold Altman is registered in NPPES with the primary taxonomy of Pediatric Hematology & Oncology 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 2007-07-08.