Gregory Tennant, D.O.
Orthopaedic Surgery Physician · Lancaster, CA
Gregory Tennant, D.O. is an orthopaedic surgery physician with a practice address in Lancaster, California, and NPI 1073581385, issued on Mar 10, 2006. Check the license (California 20A9121, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gregory Tennant
- Credential
- D.O.
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- 20A9121 CA
Self-reported in NPPES; status is on the state search - Practice location
- 42135 10TH St W Ste 101, Lancaster, CA 93534
- Phone
- (661) 726-5005
- Enumerated
- Mar 10, 2006
- Record last updated
- Aug 10, 2023
- Fax
- (661) 726-5377
- Medicare enrollment
- Enrolled (PECOS I20050923000643); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Also registered at 42135 10TH St W Ste 101
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Scott Daniel, DOPhysical Medicine & Rehabilitation Physician1861021222
- Eric Owashi, M.D.Orthopaedic Surgery Physician1396123857
- Orlando Pena, D.O.Physical Medicine & Rehabilitation Physician1689068629
- Jorge Quispe Zegarra, NPFamily Nurse Practitioner1518838192
- Justin Sherfey, DOOrthopaedic Surgery Physician1689786873
Verify Gregory Tennant in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A9121Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
331 Medicare Part D claims for 163 beneficiaries, 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. 94 claims were for opioids.
Most prescribed
- Meloxicam141 claims
- Oxycodone-Acetaminophen75 claims
- Diclofenac Sodium25 claims
- Cephalexin14 claims
- Hydrocodone-Acetaminophen14 claims
- Ibuprofen13 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: $118.87
6 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.
Bills Medicare through one group practice
- Avors Medical GroupLancaster, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory Tennant among 2,276 orthopaedic surgery physician records in California
Gregory Tennant, D.O. 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 fileYes · 59% of these records are
- Graduated1999 · median 2003 among the 1,347 with a school on file
- 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 Lancaster → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- William Croom, M.D.Lancaster, CA 935341255752648
- Pierre Hendricks, MDLancaster, CA 935341720073653
- Mohamed Lameer, M.D.Lancaster, CA 935341346339801
- Eric Owashi, M.D.Lancaster, CA 935341396123857
- Min Jung Park, MD, MMSCLancaster, CA 935341700048279
- Nitin Shah, MDLancaster, CA 935341134108103
- Justin Sherfey, DOLancaster, CA 935341689786873
- Timothy Crall, MDMammoth Lakes, CA 935461972794097
Common questions
What is Gregory Tennant, D.O.'s NPI number?
Gregory Tennant, D.O.'s National Provider Identifier (NPI) is 1073581385, issued on Mar 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Tennant, D.O. located?
The NPPES record lists a practice address at 42135 10TH St W Ste 101, Lancaster, CA, 93534. Phone: (661) 726-5005. Providers update this record themselves, so call before visiting.
How can I verify Gregory Tennant, D.O.'s license?
NPPES lists California license number 20A9121, 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 Gregory Tennant, D.O. prescribe under Medicare Part D?
In 2024, Gregory Tennant, D.O. had 331 Medicare Part D claims for 163 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.