DR. WALTER J. MULLIN PH.D.
NPI 1851449094
Social Worker - Clinical in Amherst, MA
About Dr. Walter J. Mullin Ph.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WALTER J. MULLIN PH.D. (NPI 1851449094) is an individual clinical provider in Amherst, Massachusetts, licensed in Massachusetts (104064) and active in the NPI registry since January 2007. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Walter J. Mullin Ph.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Walter Mullin reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Amherst, MA 01002
- Reassigned Medicare billing, Massachusetts enrollment
- 41 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 01002 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 18
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
AMHERST, MA 01002
AMHERST, MA 01002
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Walter Mullin's NPI number?
The NPI number for Walter Mullin is 1851449094. It was assigned to this individual provider in the NPPES registry on January 6, 2007.
Where is Walter Mullin located?
Walter Mullin practices at 48 N Pleasant St Ste 207, Amherst, MA 01002. The listed phone number is (413) 461-4042.
What is Walter Mullin's specialty?
The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.
Is Walter Mullin enrolled in Medicare?
Yes. Walter Mullin is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Walter Mullin's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Walter Mullin reassigns Medicare benefits to Amherst Psychotherapy Practice PC (Amherst, MA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Walter Mullin's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Walter Mullin was last updated on October 15, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Walter J. Mullin, PH.D. · NPI 1851449094
Clinical provider in Amherst, Massachusetts. Individual provider, active in the CMS NPPES registry since January 6, 2007.
## Identity
- **NPI:** 1851449094 (Entity type: Individual)
- **Enumerated:** January 6, 2007
- **Primary specialty:** Social Worker - Clinical · taxonomy 1041C0700X
- **State license:** 104064 (Massachusetts)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 48 N PLEASANT ST STE 207, Amherst, MA 01002-1741
- **Phone:** (413) 461-4042 · **Fax:** (413) 726-6001
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Amherst Psychotherapy Practice PC (NPI 1134760812, Amherst, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** October 15, 2020
- **Other identifiers:** Other 400430 (MA); Other P02205 (MA)
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Source: [NPI Profile](https://npiprofile.com/npi/1851449094) · Data from the CMS NPPES public registry.