DR. JASON LEE MASSA D.O.
NPI 1841636156
Psychiatry & Neurology - Neurology in Walnut Creek, CA
About Dr. Jason Lee Massa D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JASON LEE MASSA D.O. (NPI 1841636156) is an individual neurology provider in Walnut Creek, California, licensed in California (20A13615) and active in the NPI registry since May 2013. He is enrolled in Medicare PECOS and is a graduate of Other (2013).
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. Jason Lee Massa D.o. 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 Reassignments
2Medicare enrollment records show Jason Massa reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Walnut Creek, CA 94596
- Reassigned Medicare billing, California enrollment
- 12 clinicians in this Medicare group
East Liverpool, OH 43920
- Reassigned Medicare billing, Pennsylvania enrollment
- 7,114 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.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94596 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 14
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WALNUT CREEK, CA 94596
WALNUT CREEK, CA 94596
WALNUT CREEK, CA 94596
WALNUT CREEK, CA 94596
WALNUT CREEK, CA 94596
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 Jason Massa's NPI number?
The NPI number for Jason Massa is 1841636156. It was assigned to this individual provider in the NPPES registry on May 14, 2013.
Where is Jason Massa located?
Jason Massa practices at 675 Ygnacio Valley Rd Ste A102, Walnut Creek, CA 94596. The listed phone number is (925) 938-5252.
What is Jason Massa's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurology, with taxonomy code 2084N0400X.
Is Jason Massa enrolled in Medicare?
Yes. Jason Massa 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 organizations bill Medicare for Jason Massa's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Jason Massa reassigns Medicare benefits to 2 organizations: East Bay Neurology, Inc. (Walnut Creek, CA) and University Of Pittsburgh Physicians (East Liverpool, OH). Each 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 Jason Massa'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 Jason Massa was last updated on October 2, 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. Jason Lee Massa, D.O. · NPI 1841636156
Neurology physician in Walnut Creek, California. Individual provider, active in the CMS NPPES registry since May 14, 2013.
## Identity
- **NPI:** 1841636156 (Entity type: Individual)
- **Enumerated:** May 14, 2013
- **Primary specialty:** Psychiatry & Neurology - Neurology · taxonomy 2084N0400X
- **State license:** 20A13615 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 675 YGNACIO VALLEY RD, STE A102, Walnut Creek, CA 94596-3882
- **Phone:** (925) 938-5252 · **Fax:** (925) 938-1343
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): East Bay Neurology, Inc. (NPI 1164928537, Walnut Creek, CA); University Of Pittsburgh Physicians (NPI 1811945793, East Liverpool, OH) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** October 2, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1841636156) · Data from the CMS NPPES public registry.