Grace Dammann, M.D.
Internal Medicine Physician · Mill Valley, CA
Grace Dammann, M.D. is an internal medicine physician with a practice address in Mill Valley, California, and NPI 1558406736, issued on Feb 21, 2007. Check the license (California G63041, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Grace Dammann
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G63041 CA
Self-reported in NPPES; status is on the state search - Practice location
- 655 Redwood Hwy, Mill Valley, CA 94941
- Phone
- (415) 383-6623
- Enumerated
- Feb 21, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20071030000405); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 1986
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 655 Redwood Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Grace Dammann in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G63041Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
21 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
The practice group's MIPS final score for 2023 (Medicare payment program): 90.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- City And County OF San FranciscoSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Grace Dammann among 17,696 internal medicine physician records in California
Grace Dammann, M.D. 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1986 · median 2004 among the 11,065 with a school on file
- Record last updated2007 · 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).
14 internal medicine physician records list a practice address in Mill Valley
They are 14 of the 653 NPPES records with a practice address in Mill Valley, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Mill Valley → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Holly Batterman, M.D.Mill Valley, CA 949411124138276
- Kathy Chang-Lipsenthal, MDMill Valley, CA 949411356340079
- Douglas Cohen, M.D.Mill Valley, CA 949411932127248
- Laura Collins, MDMill Valley, CA 949411619976339
- Cynthia Fenton, M.D.Mill Valley, CA 949411063720431
- Deanna GreenMill Valley, CA 949411285095182
- David Kirn, MDMill Valley, CA 949411821629296
- Alison Lavoy, M.D.Mill Valley, CA 949411407871197
Common questions
What is Grace Dammann, M.D.'s NPI number?
Grace Dammann, M.D.'s National Provider Identifier (NPI) is 1558406736, issued on Feb 21, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Grace Dammann, M.D. located?
The NPPES record lists a practice address at 655 Redwood Hwy, Mill Valley, CA, 94941. Phone: (415) 383-6623. Providers update this record themselves, so call before visiting.
How can I verify Grace Dammann, M.D.'s license?
NPPES lists California license number G63041, 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 Grace Dammann, M.D. prescribe under Medicare Part D?
In 2024, Grace Dammann, M.D. had 21 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Grace Dammann, M.D.'s MIPS final score?
The 2023 MIPS final score is 90.3 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.