Mark Thomas Hellner, MD
Orthopaedic Surgery Physician · Merced, CA
Mark Thomas Hellner, MD is an orthopaedic surgery physician with a practice address in Merced, California, and NPI 1659384881, issued on Aug 15, 2006. Check the license (California G52055, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark Thomas Hellner
- Credential
- MD
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- G52055 CA
Self-reported in NPPES; status is on the state search - Practice location
- 900 W Olive Ave, Merced, CA 95348
- Phone
- (209) 388-0730
- Enumerated
- Aug 15, 2006
- Record last updated
- Aug 31, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (209) 388-0731
- Medicaid ID
- 00G520550 CA
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Verify Mark Thomas Hellner in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G52055Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
34 Medicare Part D claims, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Allopurinol11 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.
Mark Thomas Hellner among 2,276 orthopaedic surgery physician records in California
Mark Thomas Hellner, 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 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2010 · 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 Merced → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Samuel Tacke, M.D.Merced, CA 953481235236993
- Mark Via, M.D.Merced, CA 953481568553824
- Stephen Berrien, M.D.Modesto, CA 953501417933698
- Jeffrey Jett, DOModesto, CA 953501669852489
- Jesua Law, D.O.Modesto, CA 953501487090049
- William Pistel, D.O.Modesto, CA 953501518979418
- Shaunton Stubbs, DOModesto, CA 953501083300016
- Marc Trzeciak, D. O.Modesto, CA 953501033111026
Common questions
What is Mark Thomas Hellner, MD's NPI number?
Mark Thomas Hellner, MD's National Provider Identifier (NPI) is 1659384881, issued on Aug 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Thomas Hellner, MD located?
The NPPES record lists a practice address at 900 W Olive Ave, Merced, CA, 95348. Phone: (209) 388-0730. Providers update this record themselves, so call before visiting.
How can I verify Mark Thomas Hellner, MD's license?
NPPES lists California license number G52055, 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 Mark Thomas Hellner, MD prescribe under Medicare Part D?
In 2024, Mark Thomas Hellner, MD had 34 Medicare Part D claims; 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.