Nicholas Mast, MD
NPI 1932399698 · Orthopaedic Surgery Physician · Novato, CA
Nicholas Mast, MD is a Orthopaedic Surgery Physician provider in Novato, CA (NPI 1932399698).
Provider details
- NPI number
- 1932399698
- Entity type
- Individual
- Primary specialty
- Orthopaedic Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 12254 (NV)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
18 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
2 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Celecoxib | 114 | 59 |
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 41 | 29 |
| Tramadol Hcl | 28 | 24 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 16 | 12 |
| Ondansetronbrand: Ondansetron Odt | 14 | 14 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 13 | — |
These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,692 across 15 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
Additional practice locations (1)
- 2250 Hayes St Ste 208San Francisco, CA 94117Phone: (415) 530-5330Fax: (415) 530-5333
Registry dates
- Enumerated
- 2007-07-30
- Last updated
- 2023-01-09
- Certified
- 2023-01-09
Frequently asked questions
- What is Nicholas Mast's NPI number?
- Nicholas Mast's National Provider Identifier (NPI) is 1932399698, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nicholas Mast's specialty?
- Nicholas Mast is listed in the NPPES registry with a primary specialty of Orthopaedic Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Nicholas Mast located?
- Nicholas Mast's practice location on file with NPPES is 100 Rowland Way Ste 200, Novato, CA 94945-5041.
- What is Nicholas Mast's phone number?
- The practice phone number listed in the NPPES registry for Nicholas Mast is (415) 530-5330.
- Is Nicholas Mast's NPI active?
- Yes — Nicholas Mast's NPI (1932399698) is active in the NPPES registry as of the last update on 2023-01-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.