AlgorithmsArthroplasty, Replacement, HipElectronic Health Records
Dr. Nicholas H. Mast, MD
NPI1932399698
- Medicare services, 2022
- 664
- Part D claims, 2024
- 261
- Publications
- 8
- Industry payments
- $322,137
- Affiliated sites
- 2
- Practice address
- 100 Rowland Way, Suite 145, Novato, CA 94945
- Practice phone
- Call (415) 209-2500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
North Bay Regional Surgery Center
Surgery Center - Medicare-Certified · Novato, California
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Dr. Nicholas H. Mast is an orthopedic surgeon in Novato, California
Dr. Mast practices at North Bay Regional Surgery Center in Novato, California.
Dr. Mast's NPI, 1932399698, was assigned on July 30, 2007. Dr. Mast graduated from UNR Med in 2002. Dr. Mast holds California license A98951.
NPI and contact details
- NPI
- 1932399698NPI Registry (opens in a new tab)
- NPI enumeration date
- July 30, 2007
- NPI status
- Active
- Practice phone
- (415) 209-2500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 50
- Medical school graduation
- 2002
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Nicholas H. Mast practices at North Bay Regional Surgery Center in Novato, California
Dr. Mast's primary practice is North Bay Regional Surgery Center, at 100 Rowland Way, Suite 145, Novato, CA 94945. The practice phone is (415) 209-2500.
- North Bay Regional Surgery Center100 Rowland Way, Suite 145, Novato, CA 94945Phone(415) 209-2500
Source: Dmand AI Affiliation Data
Dr. Nicholas H. Mast is affiliated with 2 sites of care
Dr. Mast's primary practice is North Bay Regional Surgery Center in Novato, California. Dmand AI also links Dr. Mast to 1 physician office, named with a free account.
North Bay Regional Surgery CenterPrimary
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Nicholas H. Mast's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Mast practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| North Bay Regional Surgery Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Nicholas H. Mast is one of 2,056 orthopedic surgeons in California
Orthopaedic surgery is Dr. Mast's primary specialty in the NPI Registry, under taxonomy code 207X00000X. Dr. Mast is board certified in orthopaedic surgery by the American Board of Orthopaedic Surgery. Dmand AI has Dr. Mast's licenses on file in 4 states: California, Colorado, Nevada and Utah.
Specialties and state licenses
- Orthopaedic surgery, CaliforniaPrimary
- Colorado license
- Nevada license
- Utah license
Clinical focus
Dmand AI lists arthritis, hip replacement, pelvic and hip fracture and repeat hip or knee replacement surgery among the conditions Dr. Mast treats.
Orthopedic surgeons near Dr. Mast
Counts of orthopedic surgeons with a Dmand AI profile, by place and practice. Each opens the list.
2,056orthopedic surgeons in California
2orthopedic surgeons in Novato
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Nicholas H. Mast billed Medicare for 664 services in 2022
CMS data shows 664 Medicare services from Dr. Mast across 8 procedure codes in 2022. Medicare paid $156,817 for them.
Medicare services, 2022664
Paid by Medicare$156,817
Procedure codes8
Dr. Mast's Medicare services by type, 2021 to 2022
- 2021
- 2022
- Office and hospital visits
- 2021: 6962022: 43038%
- Surgery
- 2021: 1862022: 10842%
- Other services
- 2021: 1292022: 9626%
- Drugs given in the office
- 2021: 02022: 30
- Imaging
- 2021: 352022: 0100%
Where Dr. Mast's Medicare services took place, 2022
- In an office47572%
- In a facility18928%
Dr. Mast compared with the California median for orthopedic surgeons, 2022
- Dr. Mast
- California median
- Medicare services
- 664vs 683Close to median
- Part D claims
- 226vs 703.2 times
Medians across 1,844 orthopedic surgeons in California with Dmand AI profiles that report each measure.
Dr. Mast's most billed Medicare procedure codes, 2022
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Mast and other orthopedic surgeons in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Nicholas H. Mast's patients have a median age of 66
Across all payers, Dmand AI patient panel data puts Dr. Mast's median patient age at 66, with 56% women.
Dr. Mast's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women56%
- Men41%
Source: Dmand AI Patient Panel Data
Dr. Nicholas H. Mast wrote 261 Medicare Part D claims in 2024
In 2024, Dr. Mast wrote 261 Medicare Part D claims for 85 patients. 100% of them were for generic drugs. CMS names the drug for 226 of them, across 6 drugs with 11 or more claims each, at $5,948 in total drug cost. In 2023, CMS named 145 claims across 5 drugs.
Part D claims, 2024261
Drugs named by CMS6
Total drug cost$5,948
Part D patients85
Dr. Mast's Part D claims by kind of drug, 2024
- Generic260 claims100%
- Brand-name and other1 claims0%
Dr. Mast's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Mast's Part D claims, 2024
- Opioids34%88 of 261 claims
- Antibiotics8%22 of 261 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1452024: 22656%
Drugs named by CMS: 6 in 2024, 5 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. Nicholas H. Mast has 8 publications on record
Dmand AI links 8 papers to Dr. Mast, published from 2010 to 2025. The most frequent topics are Arthroplasty, Replacement, Hip, Radiography and Femoracetabular Impingement.
Papers8
Years published2010 to 2025
Dr. Mast's papers by year, 2010 to 2025
Topics Dr. Mast writes about most
- Arthroplasty, Replacement, Hip
- Radiography
- Femoracetabular Impingement
- Postoperative Complications
- Range of Motion, Articular
Recent publications by Dr. Mast
ArthroscopyConfidence IntervalsFemoracetabular Impingement
Clin Orthop Relat Res
ArthralgiaBiasHip Joint
J Bone Joint Surg Am
Arthroplasty, Replacement, HipPostoperative ComplicationsReoperation
J Pediatr Orthop B
AcetabulumCartilage, ArticularFemoracetabular Impingement
See who Dr. Mast researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Mast works with, so you can find a warm path to the right orthopedic surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Nicholas H. Mast received $322,137 in industry payments from 2016 to 2025
CMS Open Payments shows 299 general payments to Dr. Mast from 24 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 87% of the total. Medical Device Business Services, Inc. paid the most, $236,316.
General payments to Dr. Mast by program year, 2016 to 2025
General payments to Dr. Mast by kind, 2016 to 2025
$322.1Kin total
- Consulting fees$281,13687%
- Travel and lodging$32,40610%
- Food and beverage$8,5953%
Companies that paid Dr. Mast the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Nicholas H. Mast graduated from UNR Med
Dr. Mast graduated from UNR Med in 2002.
- Medical school
- Board certified in orthopaedic surgery
Source: Dmand AI Professional Profile Data
Dr. Nicholas H. Mast accepts plans from 12 insurance carriers
Dr. Mast is in network with 12 carriers, including Aetna, Elevance and Excellus BlueCross BlueShield. PPO plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Aetna
- Elevance
- Excellus BlueCross BlueShield
- United Healthcare
- Blue Cross Blue Shield of Michigan
- HCSC
- Alliant Health Plans
- Aspirus Health Plan
- +4 more carriersWith a free account
Plan types Dr. Mast accepts, by number of carriers
- PPO8
- HMO7
- POS6
- EPO5
- Medicare4
Source: Dmand AI Insurance Network Data
Sources for Dr. Nicholas H. Mast's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Nicholas H. Mast
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Nicholas H. Mast's NPI number?
Dr. Nicholas H. Mast's NPI number is 1932399698. It was assigned on July 30, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Nicholas H. Mast?
Dr. Nicholas H. Mast is an orthopedic surgeon in Novato, California. The primary specialty in the NPI Registry is Orthopaedic Surgery Physician (taxonomy code 207X00000X).
Where does Dr. Nicholas H. Mast practice?
Dr. Mast practices at 100 Rowland Way, Suite 145, Novato, CA 94945. Dr. Mast's primary practice is North Bay Regional Surgery Center in Novato, California. Dmand AI also links Dr. Mast to 1 physician office.
What is Dr. Nicholas H. Mast's office phone number?
The practice phone on file for Dr. Mast is (415) 209-2500.
What is Dr. Nicholas H. Mast's medical license number?
Dr. Mast holds California license A98951, one of the licenses on file in 4 states.
Which states has Dr. Nicholas H. Mast been licensed in?
Dmand AI has state licenses on file for Dr. Mast in California (2007 to 2026), Colorado (2019 to 2027), Nevada (2007 to 2027) and Utah (2003 to 2026).
Does Dr. Nicholas H. Mast accept Medicare?
Yes. CMS data shows Dr. Mast billed Medicare for 664 services in 2022.
Is Dr. Nicholas H. Mast board certified?
Yes. Dr. Mast is board certified in orthopaedic surgery by the American Board of Orthopaedic Surgery.
What services does Dr. Nicholas H. Mast bill to Medicare?
In 2022, Dr. Mast's most billed Medicare services were office visit, established patient (99213), office visit, new patient (99204) and office visit, established patient (99214).
Where did Dr. Nicholas H. Mast go to medical school?
Dr. Mast graduated from UNR Med in 2002.
Show 5 more questionsShow fewer questions
What drugs does Dr. Nicholas H. Mast prescribe most?
In 2024 Medicare Part D data, Dr. Mast's most prescribed drugs by claims were Celecoxib, Oxycodone-Acetaminophen and Tramadol HCl.
Has Dr. Nicholas H. Mast received payments from drug or device companies?
CMS Open Payments shows $322,137 in general payments to Dr. Mast from 24 companies from 2016 to 2025. The largest total came from Medical Device Business Services, Inc.
How long has Dr. Nicholas H. Mast been practicing?
Dr. Mast graduated from medical school in 2002, 24 years ago.
Does Dr. Nicholas H. Mast do research?
Dmand AI links 8 publications to Dr. Mast, published from 2010 to 2025.
What insurance does Dr. Nicholas H. Mast accept?
Dr. Mast is in network with 12 carriers, including Aetna, Elevance and Excellus BlueCross BlueShield. PPO plans come from the most carriers, 8. Check the plan with the practice before a visit.
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