Nathan A. Teismann, M.D.
Emergency Medicine Physician · San Francisco, CA
Nathan A. Teismann, M.D. is an emergency medicine physician with a practice address in San Francisco, California, and NPI 1548459282, issued on Oct 18, 2007. Check the license (California A95888, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Nathan A. Teismann
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A95888 CA
Self-reported in NPPES; status is on the state search - Practice location
- 505 Parnassus Ave, San Francisco, CA 94143
- Phone
- (415) 609-8195
- Enumerated
- Oct 18, 2007
- Record last updated
- Jan 13, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080228000768); accepts Medicare assignment
- Medical or professional school
- University Of Chicago, Pritzker School Of Medicine, 2004
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 505 Parnassus Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alexander Aabedi, MDStudent in an Organized Health Care Education/Training Program1245971480
- Kathryn Aaronson, RN, CPNPPediatric Nurse Practitioner1992030951
- Sharon AbadaStudent in an Organized Health Care Education/Training Program1003492844
- Abul Abbas, MBBSAnatomic Pathology Physician1881652964
- Jesse Abelson, MDInternal Medicine Physician1083843817
- Rhonald AbitonaAcute Care Nurse Practitioner1164993473
Verify Nathan A. Teismann in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A95888Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
23% more Medicare Part D claims than the average emergency medicine physician in 2024
277 Medicare Part D claims for 201 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 4% of claims. 72 claims were for opioids.
Most prescribed
- Cephalexin59 claims
- Hydrocodone-Acetaminophen52 claims
- Doxycycline Hyclate23 claims
- Oxycodone-Acetaminophen16 claims
- Prednisone13 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
- San Francisco Emergency Medical AssociatesSanta Rosa, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathan A. Teismann among 7,751 emergency medicine physician records in California
Nathan A. Teismann, M.D. 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 fileYes · 59% of these records are
- Graduated2004 · median 2011 among the 4,560 with a school on file
- Record last updated2011 · 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 San Francisco → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Michael Burg, MDSan Francisco, CA 941431497713150
- Laura Catena, MDSan Francisco, CA 941431225089568
- Christopher Fee, MDSan Francisco, CA 941431992762207
- Susan Lambe, MDSan Francisco, CA 941431588628598
- Matthew Lewin, MD, PHDSan Francisco, CA 941431043269277
- Daniel McDermott, MDSan Francisco, CA 941431316996556
- Jay Menaker, M.D.San Francisco, CA 941431568437176
- Lance Montauk, MDSan Francisco, CA 941431902862840
Common questions
What is Nathan A. Teismann, M.D.'s NPI number?
Nathan A. Teismann, M.D.'s National Provider Identifier (NPI) is 1548459282, issued on Oct 18, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Nathan A. Teismann, M.D. located?
The NPPES record lists a practice address at 505 Parnassus Ave, San Francisco, CA, 94143. Phone: (415) 609-8195. Providers update this record themselves, so call before visiting.
How can I verify Nathan A. Teismann, M.D.'s license?
NPPES lists California license number A95888, 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 Nathan A. Teismann, M.D. prescribe under Medicare Part D?
In 2024, Nathan A. Teismann, M.D. had 277 Medicare Part D claims for 201 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.