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

Mr. Stephen Patrick Markowski, AGPCNP

Nurse Practitioner in Waltham, MA · enumerated 2021.

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

National Provider Identifier

1366024523

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Registry record

Entity type Individual (Type 1)

Name Mr. Stephen Patrick Markowski

Credential AGPCNP

Sex Male

Practice address Waltham, MA, 02451

Phone (781) 373-2940

Enumeration date Apr 26, 2021

Last updated in NPPES May 12, 2026

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

Taxonomy & licenses

363LP2300X Primary Care Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 95015353 (CA) Secondary

163W00000X Registered Nurse Nursing Service Providers · License RN2371065 (MA) Secondary

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License RN2371065 (MA) Primary

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 1366024523 active?

Yes, as of the latest NPPES snapshot, NPI 1366024523 is active (record last updated 2026-05-12).

How do I verify Stephen Markowski's NPI record?

Cross-check NPI 1366024523 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 2026-05-12.