Nicholas H. Mast, MD
Orthopaedic Surgery Physician · Novato, CA
Nicholas H. Mast, MD is an orthopaedic surgery physician with a practice address in Novato, California, and NPI 1932399698, issued on Jul 30, 2007. Check the license (California A98951, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Nicholas H. Mast
- Credential
- MD
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License numbers
- A98951 CA
DR.0061770 CO
12254 NV
5401485-1205 UT
Self-reported in NPPES; status is on the state search - Practice location
- 100 Rowland Way Ste 200, Novato, CA 94945
- Phone
- (415) 530-5330
- Enumerated
- Jul 30, 2007
- Record last updated
- Jan 9, 2023
- Fax
- (415) 530-5333
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Verify Nicholas H. Mast in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A98951Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
25% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
261 Medicare Part D claims for 85 beneficiaries, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D. 88 claims were for opioids.
Most prescribed
- Celecoxib114 claims
- Oxycodone-Acetaminophen41 claims
- Tramadol Hcl28 claims
- Hydrocodone-Acetaminophen16 claims
- Ondansetron Odt14 claims
- Sulfamethoxazole-Trimethoprim13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $3,692.11
15 payments; by number, the most common kind was food and beverage; the largest payer was Medacta USA, Inc. The 15,003 providers of this specialty with any payment received $23,022.89 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Nicholas H. Mast among 2,276 orthopaedic surgery physician records in California
Nicholas H. Mast, MD is one of 2,276 orthopaedic surgery physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 54% of them.
- NPI issued2007 · 54% of these records are older, 35% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2023 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Orthopaedic Surgery Physician providers in California
There are 2,276 orthopaedic surgery physician records in California.
All 2,276 in California → Every provider in Novato → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Raymond Bonneau, MDNovato, CA 949451790866283
- Marilee Jasan, MDMill Valley, CA 949411093894016
- David Levinsohn, M.D.Mill Valley, CA 949411174532121
- Lauren Seo, MDMill Valley, CA 949411356803001
- Jonathan Goff, MDLarkspur, CA 949391689629388
- John Keohane, M.D.Larkspur, CA 949391134173677
- Irina Melnik, M.D.Larkspur, CA 949391902859838
- Michael Oechsel, M.D.Larkspur, CA 949391235186206
Common questions
What is Nicholas H. Mast, MD's NPI number?
Nicholas H. Mast, MD's National Provider Identifier (NPI) is 1932399698, issued on Jul 30, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Nicholas H. Mast, MD located?
The NPPES record lists a practice address at 100 Rowland Way Ste 200, Novato, CA, 94945. Phone: (415) 530-5330. Providers update this record themselves, so call before visiting.
How can I verify Nicholas H. Mast, MD's license?
NPPES lists California license number A98951, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nicholas H. Mast, MD prescribe under Medicare Part D?
In 2024, Nicholas H. Mast, MD had 261 Medicare Part D claims for 85 beneficiaries; the average among orthopaedic surgery physician prescribers was 346. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.