DR. MICHAEL D HORWICH MD, PHD
NPI 1538470976
Dermatology in Amherst, MA
About Dr. Michael D Horwich Md, Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MICHAEL D HORWICH MD, PHD (NPI 1538470976) is an individual dermatology provider in Amherst, Massachusetts, licensed in Massachusetts (258156) and active in the NPI registry since June 2010. He is enrolled in Medicare PECOS and is a graduate of University Of Massachusetts Medical School (2010).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Michael D Horwich Md, Phd is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Michael Horwich 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
- 5 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 3
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Michael Horwich's NPI number?
The NPI number for Michael Horwich is 1538470976. It was assigned to this individual provider in the NPPES registry on June 30, 2010.
Where is Michael Horwich located?
Michael Horwich practices at 29B Cottage St, Amherst, MA 01002. The listed phone number is (413) 549-7400.
What is Michael Horwich's specialty?
The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.
Is Michael Horwich enrolled in Medicare?
Yes. Michael Horwich is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Michael Horwich's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Horwich reassigns Medicare benefits to Pioneer Valley Dermatology 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 Michael Horwich'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 Michael Horwich was last updated on June 12, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 months 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. Michael D Horwich, MD, PHD · NPI 1538470976
Dermatology physician in Amherst, Massachusetts. Individual provider, active in the CMS NPPES registry since June 30, 2010.
## Identity
- **NPI:** 1538470976 (Entity type: Individual)
- **Enumerated:** June 30, 2010
- **Primary specialty:** Dermatology · taxonomy 207N00000X
- **State license:** 258156 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 29B COTTAGE ST, Amherst, MA 01002-1206
- **Phone:** (413) 549-7400 · **Fax:** (413) 549-7402
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Pioneer Valley Dermatology PC (NPI 1114020211, Amherst, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Massachusetts Medical School, class of 2010
## Record status
- **NPPES last updated:** June 12, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1538470976) · Data from the CMS NPPES public registry.