Eric John Holtrop, M.D.
Internal Medicine Physician · Grass Valley, CA
Eric John Holtrop, M.D. is an internal medicine physician with a practice address in Grass Valley, California, and NPI 1881790459, issued on Sep 14, 2006. Check the license (California A72244, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Eric John Holtrop
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A72244 CA
Self-reported in NPPES; status is on the state search - Practice location
- 280 Sierra College Dr, Grass Valley, CA 95945
- Phone
- (530) 477-4480
- Enumerated
- Sep 14, 2006
- Record last updated
- Aug 5, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (530) 274-7532
- Entity
- Type 1 · individual
Also registered at 280 Sierra College Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Eric John Holtrop in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A72244Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
29% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,266 Medicare Part D claims for 152 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 128 claims were for opioids.
Most prescribed
- Atorvastatin Calcium119 claims
- Levothyroxine Sodium85 claims
- Prednisone79 claims
- Azithromycin67 claims
- Ibandronate Sodium63 claims
- Tamsulosin Hcl62 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.
22 internal medicine physician records list a practice address in Grass Valley
They are 22 of the 1,540 NPPES records with a practice address in Grass Valley, and 17,696 internal medicine physician records in California.
All 22 in Grass Valley → All 17,696 in California → Every provider in Grass Valley →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Eric John Holtrop, M.D.'s NPI number?
Eric John Holtrop, M.D.'s National Provider Identifier (NPI) is 1881790459, issued on Sep 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Eric John Holtrop, M.D. located?
The NPPES record lists a practice address at 280 Sierra College Dr, Grass Valley, CA, 95945. Phone: (530) 477-4480. Providers update this record themselves, so call before visiting.
How can I verify Eric John Holtrop, M.D.'s license?
NPPES lists California license number A72244, 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 Eric John Holtrop, M.D. prescribe under Medicare Part D?
In 2024, Eric John Holtrop, M.D. had 2,266 Medicare Part D claims for 152 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.