NPI Portal NPI Lookup & Verification

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

Dr. Paul P Harasimowicz III, M. D.

Specialist in Ayer, MA · enumerated 2005.

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

National Provider Identifier

1538152574

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Registry record

Entity type Individual (Type 1)
Name Dr. Paul P Harasimowicz III
Credential M. D.
Sex Male
Practice address Ayer, MA, 01432
Phone (978) 772-9846
Fax (978) 772-1180
Enumeration date Aug 24, 2005
Last updated in NPPES Jun 11, 2009

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 73797 (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
3078272 Medicaid MA -
9779612 Medicaid MA -

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 Paul Harasimowicz's NPI record?
Cross-check NPI 1538152574 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1538152574 active?
Yes, as of the latest NPPES snapshot, NPI 1538152574 is active (record last updated 2009-06-11).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-06-11.