Thomas Daniel Erskine, M.D.
Internal Medicine Physician · Vacaville, CA
Thomas Daniel Erskine, M.D. is an internal medicine physician with a practice address in Vacaville, California, and NPI 1194732339, issued on Aug 1, 2006. Check the license (California A63845, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas Daniel Erskine
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A63845 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1010 Nut Tree RD, Vacaville, CA 95687
- Phone
- (707) 624-7979
- Enumerated
- Aug 1, 2006
- Record last updated
- Feb 21, 2017 (not updated in 9 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20210205002038); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 1996
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1010 Nut Tree RD
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Verify Thomas Daniel Erskine in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A63845Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average internal medicine physician in 2024
6,868 Medicare Part D claims for 662 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 165 claims were for opioids.
Most prescribed
- Atorvastatin Calcium532 claims
- Amlodipine Besylate375 claims
- Levothyroxine Sodium336 claims
- Omeprazole257 claims
- Lisinopril230 claims
- Rosuvastatin Calcium192 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
- St Lukes Clinic-Treasure Valley LLCEagle, ID
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas Daniel Erskine among 17,696 internal medicine physician records in California
Thomas Daniel Erskine, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% 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, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1996 · median 2004 among the 11,065 with a school on file
- Record last updated2017 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
53 internal medicine physician records list a practice address in Vacaville
They are 53 of the 1,903 NPPES records with a practice address in Vacaville, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Vacaville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nicolas Aguilera, M.D.Vacaville, CA 956871780876508
- Kulbir Bajwa, M.D.Vacaville, CA 956871912000126
- Yuen Chen, MDVacaville, CA 956871407925605
- Garth Davis, MDVacaville, CA 956871770535692
- Bethlehem Haile, M.DVacaville, CA 956871063605103
- Ali Hassani, MDVacaville, CA 956871487818373
- Aurora Haworth, M.D.Vacaville, CA 956871164684932
- Gurjit Kaur, MDVacaville, CA 956871922635580
Common questions
What is Thomas Daniel Erskine, M.D.'s NPI number?
Thomas Daniel Erskine, M.D.'s National Provider Identifier (NPI) is 1194732339, issued on Aug 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Daniel Erskine, M.D. located?
The NPPES record lists a practice address at 1010 Nut Tree RD, Vacaville, CA, 95687. Phone: (707) 624-7979. Providers update this record themselves, so call before visiting.
How can I verify Thomas Daniel Erskine, M.D.'s license?
NPPES lists California license number A63845, 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 Thomas Daniel Erskine, M.D. prescribe under Medicare Part D?
In 2024, Thomas Daniel Erskine, M.D. had 6,868 Medicare Part D claims for 662 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.