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

Dr. Walter J. Mullin, PH.D.

Clinical Social Worker in Amherst, MA · enumerated 2007 · practices at Amherst Psychotherapy Practice PC.

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

National Provider Identifier

1851449094

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Registry record

Entity type Individual (Type 1)

Name Dr. Walter J. Mullin

Credential PH.D.

Sex Male

Practice address Amherst, MA, 01002

Phone (413) 461-4042

Fax (413) 726-6001

Enumeration date Jan 6, 2007

Last updated in NPPES Oct 15, 2020

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

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 104064 (MA) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier	Type	State	Issuer
400430	Other	MA	MAGELLAN
P02205	Other	MA	BLUE CROSS BLUE SHIELD

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 Walter Mullin's NPI record?

Cross-check NPI 1851449094 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1851449094 active?

Yes, as of the latest NPPES snapshot, NPI 1851449094 is active (record last updated 2020-10-15).

Other providers at this practice address

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Paul Roud Psychologist · Amherst, MA NPI 1487791471 Jody Wallace Clinical Social Worker · Amherst, MA NPI 1841313590 Duarji Rivas Clinical Social Worker · Amherst, MA NPI 1073795415 Christy O'Brien Clinical Social Worker · Amherst, MA NPI 1992014351 Olga Gardner Mental Health Counselor · Amherst, MA NPI 1033497680 Alexandra Scalfano Clinical Social Worker · Amherst, MA NPI 1467866830 Michael Chunyk Clinical Social Worker · Amherst, MA NPI 1215313994 Leah Martinelli Clinical Social Worker · Amherst, MA NPI 1184092066

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-10-15.