John Nicholas Diana, M.D.
Adult Reconstructive Orthopaedic Surgery Physician · Napa, CA
John Nicholas Diana, M.D. is an adult reconstructive orthopaedic surgery physician with a practice address in Napa, California, and NPI 1649297540, issued on Jul 16, 2006. Check the license (California A87859, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Nicholas Diana
- Credential
- M.D.
- Primary taxonomy
- Adult Reconstructive Orthopaedic Surgery Physician 207XS0114X
- License number
- A87859 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3273 Claremont Way, Napa, CA 94558
- Phone
- (707) 254-7117
- Enumerated
- Jul 16, 2006
- Record last updated
- Oct 22, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (707) 265-6435
- Medicaid ID
- 00A878590 CA
- Medicare enrollment
- Enrolled (PECOS I20041103000333); accepts Medicare assignment
- Medical or professional school
- Indiana University School Of Medicine, 1996
- Entity
- Type 1 · individual
8 nearest adult reconstructive orthopaedic surgery physician records → All 147 in California → Look up another NPI →
Also registered at 3273 Claremont Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mia Alarcon, P.A.- CPhysician Assistant1184857542
- Daniel Birkbeck, MDOrthopaedic Hand Surgery Physician1265433254
- Megan Ford, PAPhysician Assistant1609281252
- Brian Freeto, M.D.Sports Medicine (Orthopaedic Surgery) Physician1962573576
- Angela Geaslin, OTROccupational Therapist1194150292
- Margaret Gokey, MS, OTR/L, CHTHand Occupational Therapist1861683898
Verify John Nicholas Diana in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A87859Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
49% fewer Medicare Part D claims than the average adult reconstructive orthopaedic surgery physician in 2024
296 Medicare Part D claims for 196 beneficiaries, against an average of 579 among the 1,112 providers of this specialty who prescribed in Part D. 43 claims were for opioids.
Most prescribed
- Amoxicillin187 claims
- Clindamycin Hcl24 claims
- Tramadol Hcl24 claims
- Oxycodone Hcl12 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 78.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $157,725.49
22 payments; by number, the most common kind was royalty or license; the largest payer was Ortho Development Corporation. The 1,060 providers of this specialty with any payment received $68,015.27 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.
Bills Medicare through 3 group practices
- Adventist Health Physicians NetworkSaint Helena, CA
- Napa Valley Orthopaedic Medical Group IncNapa, CA
- St. Helena HospitalSaint Helena, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Nicholas Diana among 147 adult reconstructive orthopaedic surgery physician records in California
John Nicholas Diana, M.D. is one of 147 adult reconstructive orthopaedic surgery physician records with a practice address in California. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 68% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 76% of these records are
- Graduated1996 · median 2009 among the 112 with a school on file
- Record last updated2014 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207XS0114X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Adult Reconstructive Orthopaedic Surgery Physician providers in California
There are 147 adult reconstructive orthopaedic surgery physician records in California.
All 147 in California → Every provider in Napa → Adult Reconstructive Orthopaedic Surgery Physician nationwide →
The 8 adult reconstructive orthopaedic surgery physician records with the nearest ZIP codes
- Alexander Bradley, MDDublin, CA 945681194259077
- Aaron Salyapongse, MDDublin, CA 945681598711681
- Ryan Moore, MDSaint Helena, CA 945741528266202
- Alexander Sah, MDFremont, CA 945381003966359
- Matthew Booth, MDTravis Afb, CA 945351063078319
- Ian Tuznik, M.D.Travis Afb, CA 945351629310743
- Joseph Buck, M.D.Walnut Creek, CA 945961366837304
- Stefan Jibodh, M.D.Walnut Creek, CA 945961508875642
Common questions
What is John Nicholas Diana, M.D.'s NPI number?
John Nicholas Diana, M.D.'s National Provider Identifier (NPI) is 1649297540, issued on Jul 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Nicholas Diana, M.D. located?
The NPPES record lists a practice address at 3273 Claremont Way, Napa, CA, 94558. Phone: (707) 254-7117. Providers update this record themselves, so call before visiting.
How can I verify John Nicholas Diana, M.D.'s license?
NPPES lists California license number A87859, 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 John Nicholas Diana, M.D. prescribe under Medicare Part D?
In 2024, John Nicholas Diana, M.D. had 296 Medicare Part D claims for 196 beneficiaries; the average among adult reconstructive orthopaedic surgery physician prescribers was 579. Part D covers Medicare prescriptions only.
What is John Nicholas Diana, M.D.'s MIPS final score?
The 2023 MIPS final score is 78.7 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.