Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Heather Wolf, M.D.

Internal Medicine Physician in Watertown, MA · enumerated 2006.

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

National Provider Identifier

1841259595

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Registry record

Entity type Individual (Type 1)

Name Heather Wolf

Credential M.D.

Sex Female

Practice address 485 Arsenal St, Internal Medicine B, Watertown, MA, 02472

Phone (617) 972-5240

Enumeration date Mar 21, 2006

Last updated in NPPES Dec 20, 2021

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 223907 (MA) 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
494252	Other	MA	TUFTS
AA44631	Other	MA	HARVARD PILGRIM
J29407	Other	MA	BLUE CROSS

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 NPI 1841259595 active?

Yes, as of the latest NPPES snapshot, NPI 1841259595 is active (record last updated 2021-12-20).

How do I verify Heather Wolf's NPI record?

Cross-check NPI 1841259595 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-20.