Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Robert W Walker, MD

Pediatrics Physician in Marshfield, MA · enumerated 2005.

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

National Provider Identifier

1235111865

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Registry record

Entity type Individual (Type 1)

Name Dr. Robert W Walker

Credential MD

Sex Male

Practice address 435 Furnace St, Marshfield, MA, 02050

Phone (781) 837-7200

Fax (781) 837-7255

Enumeration date Nov 18, 2005

Last updated in NPPES May 2, 2012

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 44649 (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
04 2297845	Other	MA	UNICARE
04 2297845	Other	MA	HCVM
04 2297845	Other	MA	PRIVATE HEALTHCARE SYSTEM
J11011	Other	MA	BCBS
04 2297845	Other	MA	TRICARE
04 2297845	Other	MA	GREAT WEST HEALTH CARE
0551690002	Other	MA	CIGNA
4237789	Other	MA	AETNA
712444	Other	MA	TUFTS
04 2297845	Other	MA	GIC
200158	Other	MA	HVD PILGRIM HEALTH CARE
2089629	Medicaid	MA	-
34727	Other	MA	FALLON
04 2297845	Other	MA	DOC FIRST
04 2297845	Other	MA	UNITED HEALTH CARE
712444	Other	MA	SECURE HORIZONS

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 1235111865 active?

Yes, as of the latest NPPES snapshot, NPI 1235111865 is active (record last updated 2012-05-02).

How do I verify Robert Walker's NPI record?

Cross-check NPI 1235111865 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 2012-05-02.