Birgit Maass, MD
Anesthesiology Physician · Palo Alto, CA
Birgit Maass, MD is an anesthesiology physician with a practice address in Palo Alto, California, and NPI 1639104961, issued on Jul 12, 2006. Check the license (California A89403, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Birgit Maass
- Credential
- MD
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License numbers
- A89403 CA
227885 MA
Self-reported in NPPES; status is on the state search - Practice location
- 725 Welch RD, Palo Alto, CA 94304
- Phone
- (650) 497-8000
- Enumerated
- Jul 12, 2006
- Record last updated
- Apr 11, 2024
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 7,571 in California → Look up another NPI →
Also registered at 725 Welch RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Birgit Maass in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A89403Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Birgit Maass among 7,571 anesthesiology physician records in California
Birgit Maass, MD is one of 7,571 anesthesiology physician records with a practice address in California. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 53% newer
- In a Medicare fileNo · 71% of these records are
- In the CMS Doctors and Clinicians fileNo · 64% of these records are
- Record last updated2024 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
111 anesthesiology physician records list a practice address in Palo Alto
They are 111 of the 7,617 NPPES records with a practice address in Palo Alto, and 7,571 anesthesiology physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 7,571 in California → Every provider in Palo Alto → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- David Berger, MDPalo Alto, CA 943041598715922
- Kevin Fish, MDPalo Alto, CA 943041316963960
- Margaret Fish, M.B. CH.B.Palo Alto, CA 943041265452700
- Natasha Funck, M.D.Palo Alto, CA 943041245251123
- David Gaba, M.D.Palo Alto, CA 943041639274798
- Thomas Harrison, MDPalo Alto, CA 943041902994965
- Steven Howard, M.D.Palo Alto, CA 943041518986587
- Komal Kamra, MDPalo Alto, CA 943041124045927
Common questions
What is Birgit Maass, MD's NPI number?
Birgit Maass, MD's National Provider Identifier (NPI) is 1639104961, issued on Jul 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Birgit Maass, MD located?
The NPPES record lists a practice address at 725 Welch RD, Palo Alto, CA, 94304. Phone: (650) 497-8000. Providers update this record themselves, so call before visiting.
How can I verify Birgit Maass, MD's license?
NPPES lists California license number A89403, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.