Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Otto Walter, MD

Anatomic Pathology Physician in Worcester, MA · enumerated 2007.

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

National Provider Identifier

1801942628

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Registry record

Entity type Individual (Type 1)

Name Otto Walter

Credential MD

Sex Male

Practice address 55 Lake Ave N, Department of Pathology, Worcester, MA, 01655

Phone (508) 793-6100

Fax (508) 793-6110

Enumeration date Jan 26, 2007

Last updated in NPPES Jul 27, 2011

Taxonomy & licenses

207ZP0101X Anatomic Pathology Physician Allopathic & Osteopathic Physicians · License 239752 (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
110085735A	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 Otto Walter's NPI record?

Cross-check NPI 1801942628 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1801942628 active?

Yes, as of the latest NPPES snapshot, NPI 1801942628 is active (record last updated 2011-07-27).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-07-27.