Thomas Aaron Grotsky, MD
Emergency Medicine Physician · Irvine, CA
Thomas Aaron Grotsky, MD is an emergency medicine physician with a practice address in Irvine, California, and NPI 1639350366, issued on Nov 21, 2007. Check the license (California A98690, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas Aaron Grotsky
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A98690 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3 Schubert CT, Irvine, CA 92617
- Phone
- (949) 364-3826
- Enumerated
- Nov 21, 2007
- Record last updated
- Dec 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Verify Thomas Aaron Grotsky in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A98690Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5% fewer Medicare Part D claims than the average emergency medicine physician in 2024
215 Medicare Part D claims for 173 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 17 claims were for opioids.
Most prescribed
- Cefadroxil16 claims
- Hydrocodone-Acetaminophen14 claims
- Amoxicillin-Clavulanate Potass12 claims
- Albuterol Sulfate Hfa11 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.
Thomas Aaron Grotsky among 7,751 emergency medicine physician records in California
Thomas Aaron Grotsky, MD is one of 7,751 emergency 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 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 50% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2021 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Irvine → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Nicholas Bove, MDIrvine, CA 926181255837837
- Ahmed Elrefaie, M.D.Irvine, CA 926181578820155
- Stephen Gau, M.D.Irvine, CA 926181942640354
- Ryan Hurd, M.D.Irvine, CA 926181255377156
- Ethan Kunstadt, M.D.Irvine, CA 926181992167993
- Cong LyIrvine, CA 926181649456682
- Cassondra Majestic, M.D.Irvine, CA 926181538501705
- Peter Nguyen, D.O.Irvine, CA 926181871933366
Common questions
What is Thomas Aaron Grotsky, MD's NPI number?
Thomas Aaron Grotsky, MD's National Provider Identifier (NPI) is 1639350366, issued on Nov 21, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Aaron Grotsky, MD located?
The NPPES record lists a practice address at 3 Schubert CT, Irvine, CA, 92617. Phone: (949) 364-3826. Providers update this record themselves, so call before visiting.
How can I verify Thomas Aaron Grotsky, MD's license?
NPPES lists California license number A98690, 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 Aaron Grotsky, MD prescribe under Medicare Part D?
In 2024, Thomas Aaron Grotsky, MD had 215 Medicare Part D claims for 173 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.