Timothy Litwin, D.O.
Internal Medicine Physician · Oakland, CA
Timothy Litwin, D.O. is an internal medicine physician with a practice address in Oakland, California, and NPI 1891032421, issued on Jan 16, 2013. Check the license (California 20A12348, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Timothy Litwin
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20A12348 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1411 E 31St St, Oakland, CA 94602
- Phone
- (510) 437-3800
- Enumerated
- Jan 16, 2013
- Record last updated
- Dec 15, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20131211001528); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1411 E 31St St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shahram Aarabi, MDVascular Surgery Physician1972700458
- Marwan Abdelrahim, M.D.Internal Medicine Physician1538693650
- Oluwayemisi Adejumo, M.D.Interventional Cardiology Physician1699031179
- Tessa Adler, MDEmergency Medicine Physician1558065524
- Omonivie Agboghidi, MDStudent in an Organized Health Care Education/Training Program1104576065
- Ruta AionoLactation Consultant (Non-RN)1518833375
Verify Timothy Litwin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A12348Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
32% more Medicare Part D claims than the average internal medicine physician in 2024
4,205 Medicare Part D claims for 712 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims. 200 claims were for opioids.
Most prescribed
- Atorvastatin Calcium427 claims
- Amlodipine Besylate195 claims
- Lisinopril184 claims
- Losartan Potassium153 claims
- Hydrocodone-Acetaminophen114 claims
- Atenolol112 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
- Permanente Medical Group IncRedwood City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Timothy Litwin among 17,696 internal medicine physician records in California
Timothy Litwin, D.O. 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
- Graduated2010 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 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).
432 internal medicine physician records list a practice address in Oakland
They are 432 of the 18,558 NPPES records with a practice address in Oakland, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Oakland → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Lyn Berry, MDOakland, CA 946021528078193
- Helen Driscoll, MDOakland, CA 946021720168230
- Julia Follette, M.D.Oakland, CA 946021730364480
- Sheira Freedman, MDOakland, CA 946021700896396
- Elaina Guerin, D.O.Oakland, CA 946021720286446
- Kathleen Hicks, M.D.Oakland, CA 946021902850209
- Francisco Isolani, M.D.Oakland, CA 946021326185265
- Annemarie Mallick, D.O.Oakland, CA 946021588633507
Common questions
What is Timothy Litwin, D.O.'s NPI number?
Timothy Litwin, D.O.'s National Provider Identifier (NPI) is 1891032421, issued on Jan 16, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Timothy Litwin, D.O. located?
The NPPES record lists a practice address at 1411 E 31St St, Oakland, CA, 94602. Phone: (510) 437-3800. Providers update this record themselves, so call before visiting.
How can I verify Timothy Litwin, D.O.'s license?
NPPES lists California license number 20A12348, 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 Timothy Litwin, D.O. prescribe under Medicare Part D?
In 2024, Timothy Litwin, D.O. had 4,205 Medicare Part D claims for 712 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.