Henry Markley Gass, M.D.
Orthopaedic Surgery Physician · Tustin, CA
Henry Markley Gass, M.D. is an orthopaedic surgery physician with a practice address in Tustin, California, and NPI 1346637949, issued on Apr 21, 2015. Check the license (California A201942, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Henry Markley Gass
- Credential
- M.D.
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- A201942 CA
Self-reported in NPPES; status is on the state search - Practice location
- 14642 Newport Ave Ste 105, Tustin, CA 92780
- Phone
- (949) 688-0958
- Enumerated
- Apr 21, 2015
- Record last updated
- Aug 6, 2026
- Fax
- (949) 688-0960
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Also registered at 14642 Newport Ave Ste 105
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jaron Andersen, MDOrthopaedic Surgery Physician1639381759
- Mark Cubberly, MDOrthopaedic Surgery Physician1760923114
- Charles Chol Bae Kim, MDAdult Medicine Physician1225564818
- Gwyneth Kim, FNPFamily Nurse Practitioner1154997682
- Kelvin Kim, STUDENTSports Medicine (Orthopaedic Surgery) Physician1376031195
Verify Henry Markley Gass in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A201942Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $544.55
9 payments; by number, the most common kind was food and beverage; the largest payer was Stryker Corporation. 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.
Henry Markley Gass among 2,276 orthopaedic surgery physician records in California
Henry Markley Gass, M.D. 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 2015, is newer than 84% of them.
- NPI issued2015 · 84% of these records are older, 14% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2026 · 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 Tustin → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Jaron Andersen, MDTustin, CA 927801639381759
- Soheil Aval, MDTustin, CA 927801891837373
- Mark Cubberly, MDTustin, CA 927801760923114
- David Kim, MDTustin, CA 927801174665079
- Joseph Swickard, M.D.Tustin, CA 927801083618623
- Marappa Gopinath, MDTustin, CA 927821023163623
- Todd Katzman, MDAnaheim, CA 928011548279029
- Jose Senador, M.D.Anaheim, CA 928011679592547
Common questions
What is Henry Markley Gass, M.D.'s NPI number?
Henry Markley Gass, M.D.'s National Provider Identifier (NPI) is 1346637949, issued on Apr 21, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Henry Markley Gass, M.D. located?
The NPPES record lists a practice address at 14642 Newport Ave Ste 105, Tustin, CA, 92780. Phone: (949) 688-0958. Providers update this record themselves, so call before visiting.
How can I verify Henry Markley Gass, M.D.'s license?
NPPES lists California license number A201942, 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.
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.