Jason Massa, D.O.
NPI 1841636156 · Neurology Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jason Massa, D.O. is a Neurology Physician provider in Walnut Creek, CA (NPI 1841636156).
Provider details
- NPI number
- 1841636156
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 20A13615 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
13 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
527 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 247 | $20 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 191 | $162 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 64 | $224 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 25 | $275 |
Typical Medicare-allowed amounts for these services range $20–$275 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 18 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Carbidopa/Levodopabrand: Carbidopa-Levodopa | 301 | 93 |
| Carbidopa/Levodopabrand: Carbidopa-Levodopa Er | 107 | 34 |
| Carbidopa/Levodopabrand: Rytary | 85 | 17 |
| Amantadine Hclbrand: Amantadine | 55 | 13 |
| Donepezil Hcl | 53 | 12 |
| Citalopram Hydrobromidebrand: Citalopram Hbr | 39 | — |
| Clonazepam |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$631 across 24 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-05-14
- Last updated
- 2020-10-02
- Certified
- 2020-10-02
Frequently asked questions
- What is Jason Massa's NPI number?
- Jason Massa's National Provider Identifier (NPI) is 1841636156, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jason Massa's specialty?
- Jason Massa is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Jason Massa located?
- Jason Massa's practice location on file with NPPES is 675 Ygnacio Valley Rd, Walnut Creek, CA 94596-3882.
- What is Jason Massa's phone number?
- The practice phone number listed in the NPPES registry for Jason Massa is (925) 938-5252.
- Does Jason Massa accept Medicare?
- Jason Massa is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jason Massa's NPI active?
- Yes — Jason Massa's NPI (1841636156) is active in the NPPES registry as of the last update on 2020-10-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.