Derek John Bays, MD
Internal Medicine Physician · Sacramento, CA
Derek John Bays, MD is an internal medicine physician with a practice address in Sacramento, California, and NPI 1932541257, issued on Jul 29, 2013. Check the license (California A149095, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Derek John Bays
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A149095 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4610 X St, Sacramento, CA 95817
- Phone
- (916) 816-0421
- Enumerated
- Jul 29, 2013
- Record last updated
- Apr 17, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20180613001196); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 2015
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 4610 X St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ferheen AbbasiStudent in an Organized Health Care Education/Training Program1518745108
- Geraldine Abilo CardenasSpecialist1871481606
- James AboagyeStudent in an Organized Health Care Education/Training Program1235955998
- Christopher AdamsStudent in an Organized Health Care Education/Training Program1285223446
- Erika AdamsStudent in an Organized Health Care Education/Training Program1528769767
- Lindsay AdamsSpecialist1417831991
Verify Derek John Bays in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A149095Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average internal medicine physician in 2024
326 Medicare Part D claims for 45 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 55% of claims.
Most prescribed
- Biktarvy35 claims
- Triumeq29 claims
- Juluca26 claims
- Tivicay25 claims
- Doxycycline Hyclate20 claims
- Estradiol16 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
- Regents OF The Univ OF CASacramento, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Derek John Bays among 17,696 internal medicine physician records in California
Derek John Bays, MD 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 2013, is newer than 71% of them.
- NPI issued2013 · 71% of these records are older, 26% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2015 · median 2004 among the 11,065 with a school on file
- Record last updated2019 · 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).
601 internal medicine physician records list a practice address in Sacramento
They are 601 of the 33,083 NPPES records with a practice address in Sacramento, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Sacramento → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Lynne Do, M.D.Sacramento, CA 958171386627644
- Jason Ferries, M.D.Sacramento, CA 958171609859974
- Steven Griffen, M.D.Sacramento, CA 958171053393835
- Diane Haddock, M.D.Sacramento, CA 958171013991553
- Calvin Hirsch, MDSacramento, CA 958171073597332
- Hershan Johl, MDSacramento, CA 958171255314399
Common questions
What is Derek John Bays, MD's NPI number?
Derek John Bays, MD's National Provider Identifier (NPI) is 1932541257, issued on Jul 29, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Derek John Bays, MD located?
The NPPES record lists a practice address at 4610 X St, Sacramento, CA, 95817. Phone: (916) 816-0421. Providers update this record themselves, so call before visiting.
How can I verify Derek John Bays, MD's license?
NPPES lists California license number A149095, 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 Derek John Bays, MD prescribe under Medicare Part D?
In 2024, Derek John Bays, MD had 326 Medicare Part D claims for 45 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.