Leif R. Hass, M.D.
Hospitalist Physician · Oakland, CA
Leif R. Hass, M.D. is a hospitalist physician with a practice address in Oakland, California, and NPI 1528175346, issued on Aug 25, 2006. Check the license (California G80367, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Leif R. Hass
- Credential
- M.D.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- G80367 CA
Self-reported in NPPES; status is on the state search - Practice location
- 350 Hawthorne Ave RM 2346, Oakland, CA 94609
- Phone
- (510) 869-6883
- Enumerated
- Aug 25, 2006
- Record last updated
- Apr 11, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicaid ID
- 00G803670 CA
- Medicare enrollment
- Enrolled (PECOS I20050321000222); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 3,099 in California → Look up another NPI →
Also registered at 350 Hawthorne Ave RM 2346
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nkemdi Agwaramgbo, MDHospitalist Physician1053998682
- Vijay AluruInternal Medicine Physician1588026488
- Sharon Chan, M.D.Hospitalist Physician1013233964
- Paul Cheung, M.D.Internal Medicine Physician1942647060
- Matthew Dahnke, M.D.Hospitalist Physician1487762092
- James Felt, M.D.Hospitalist Physician1073621157
Verify Leif R. Hass in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G80367Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
21% fewer Medicare Part D claims than the average hospitalist physician in 2024
411 Medicare Part D claims for 136 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D. 19 claims were for opioids.
Most prescribed
- Amlodipine Besylate21 claims
- Prednisone21 claims
- Pantoprazole Sodium17 claims
- Eliquis16 claims
- Atorvastatin Calcium14 claims
- Hydrocodone-Acetaminophen14 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
- Sutter Bay Medical FoundationOakland, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Leif R. Hass among 3,099 hospitalist physician records in California
Leif R. Hass, M.D. is one of 3,099 hospitalist physician records with a practice address in California. 90% 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 2% of them.
- NPI issued2006 · 2% of these records are older, 73% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 81% of these records are
- Graduated1993 · median 2010 among the 2,505 with a school on file
- Record last updated2019 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in California
There are 3,099 hospitalist physician records in California.
All 3,099 in California → Every provider in Oakland → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Matthew Dahnke, M.D.Oakland, CA 946091487762092
- Joann Dominguez, MDOakland, CA 946091811003809
- James Felt, M.D.Oakland, CA 946091073621157
- Martin Garcia, M.D.Oakland, CA 946091619084423
- Erwin KuoOakland, CA 946091437266269
- Daniel Montes, M.D.Oakland, CA 946091487737755
- Lloyd Morrissey, M.D.Oakland, CA 946091801903562
- Alexander Ramirez, MDOakland, CA 946091538266424
Common questions
What is Leif R. Hass, M.D.'s NPI number?
Leif R. Hass, M.D.'s National Provider Identifier (NPI) is 1528175346, issued on Aug 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Leif R. Hass, M.D. located?
The NPPES record lists a practice address at 350 Hawthorne Ave RM 2346, Oakland, CA, 94609. Phone: (510) 869-6883. Providers update this record themselves, so call before visiting.
How can I verify Leif R. Hass, M.D.'s license?
NPPES lists California license number G80367, 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 Leif R. Hass, M.D. prescribe under Medicare Part D?
In 2024, Leif R. Hass, M.D. had 411 Medicare Part D claims for 136 beneficiaries; the average among hospitalist physician prescribers was 521. 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.