Tanya A. Threewitt, M.D.
Family Medicine Physician · Concord, CA
Tanya A. Threewitt, M.D. is a family medicine physician with a practice address in Concord, California, and NPI 1699708610, issued on Jul 10, 2006. Check the license (California A73909, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Tanya A. Threewitt
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A73909 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5161 Clayton RD, Concord, CA 94521
- Phone
- (925) 609-8282
- Enumerated
- Jul 10, 2006
- Record last updated
- Jun 21, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (925) 609-8826
- Medicaid ID
- 00A739090 CA
- Medicare enrollment
- Enrolled (PECOS I20090316000340); accepts Medicare assignment
- Medical or professional school
- Drexel University College Of Medicine, 1999
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 5161 Clayton RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Diane Chandler, D.O.Family Medicine Physician1760466312
- Steven Moon, D.C.Chiropractor1386761880
- David Thornton, DDSDentist1144397761
- Michael Varon, M.D.Family Medicine Physician1386662641
Verify Tanya A. Threewitt in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A73909Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
20% fewer Medicare Part D claims than the average family medicine physician in 2024
2,828 Medicare Part D claims for 263 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 46 claims were for opioids.
Most prescribed
- Atorvastatin Calcium242 claims
- Levothyroxine Sodium128 claims
- Amlodipine Besylate103 claims
- Losartan Potassium74 claims
- Rosuvastatin Calcium73 claims
- Zolpidem Tartrate72 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.
Bills Medicare through one group practice
- John Muir Physician NetworkConcord, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Tanya A. Threewitt among 17,133 family medicine physician records in California
Tanya A. Threewitt, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1999 · median 2005 among the 10,652 with a school on file
- Record last updated2012 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
38 family medicine physician records list a practice address in Concord
They are 38 of the 9,328 NPPES records with a practice address in Concord, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Concord → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Anthony Ryan Aguirre, MDConcord, CA 945211386907624
- Diane Chandler, D.O.Concord, CA 945211760466312
- Jaskaran Khela, DOConcord, CA 945211073074944
- Charles Renner, M.D.Concord, CA 945211669439733
- Elisabeth Renner, M.D.Concord, CA 945211275642910
- Michael Varon, M.D.Concord, CA 945211386662641
- Kristina Carpenter, D.O.Concord, CA 945201952741985
- Rachelle Hanft, MDConcord, CA 945201437306313
Common questions
What is Tanya A. Threewitt, M.D.'s NPI number?
Tanya A. Threewitt, M.D.'s National Provider Identifier (NPI) is 1699708610, issued on Jul 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Tanya A. Threewitt, M.D. located?
The NPPES record lists a practice address at 5161 Clayton RD, Concord, CA, 94521. Phone: (925) 609-8282. Providers update this record themselves, so call before visiting.
How can I verify Tanya A. Threewitt, M.D.'s license?
NPPES lists California license number A73909, 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 Tanya A. Threewitt, M.D. prescribe under Medicare Part D?
In 2024, Tanya A. Threewitt, M.D. had 2,828 Medicare Part D claims for 263 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.