Kathryn Amacher, DO
Geriatric Medicine (Internal Medicine) Physician · Vacaville, CA
Kathryn Amacher, DO is a geriatric medicine (internal medicine) physician with a practice address in Vacaville, California, and NPI 1366545568, issued on Sep 6, 2006. Check the license (California 20A5091, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Kathryn Amacher
- Credential
- DO
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- 20A5091 CA
Self-reported in NPPES; status is on the state search - Practice location
- 269 Sage Sparrow Cir, Vacaville, CA 95687
- Phone
- (707) 451-4111
- Enumerated
- Sep 6, 2006
- Record last updated
- Mar 27, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (707) 451-9803
- Medicare enrollment
- Enrolled (PECOS I20031114000641); accepts Medicare assignment
- Medical or professional school
- Midwestern University, Chicago College Of Osteopathic Med, 1983
- Entity
- Type 1 · individual
Also registered at 269 Sage Sparrow Cir
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michael Richardson, M.D.Geriatric Medicine (Family Medicine) Physician1831327899
- Christine Romer, LCSWClinical Social Worker1295980811
- Anita Stonawski-Semple, DNP, FNPFamily Nurse Practitioner1063844314
Verify Kathryn Amacher in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A5091Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.7 times the Medicare Part D claims of the average geriatric medicine (internal medicine) physician in 2024
15,871 Medicare Part D claims for 527 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 923 claims were for opioids.
Most prescribed
- Atorvastatin Calcium601 claims
- Gabapentin526 claims
- Eliquis495 claims
- Levothyroxine Sodium483 claims
- Amlodipine Besylate422 claims
- Hydrocodone-Acetaminophen392 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.
The MIPS final score for 2023 (Medicare payment program): 67.6 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Snf Rehab OnlyVacaville, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in California
There are 532 geriatric medicine (internal medicine) physician records in California.
Other geriatric medicine (internal medicine) physician records in California
- Adil Abbasi, M.D.La Jolla, CA1548261316
- Shashidar Acharya, M.D.Orange, CA1770685521
- Marie AdachiLos Angeles, CA1629496740
- Pouya Afshar, M.D.San Diego, CA1184958977
- Parag Agnihotri, M.D.San Diego, CA1447351085
- Andreas Ahlas, M.D.Bakersfield, CA1326200833
- Waseem Ahmed, MDSanta Rosa, CA1386803559
- Paul AisenSan Diego, CA1669470753
- Mahmuda Alam, M.D.Glendale, CA1568659985
- Cathy Alessi, M.D.North Hills, CA1134224983
Common questions
What is Kathryn Amacher, DO's NPI number?
Kathryn Amacher, DO's National Provider Identifier (NPI) is 1366545568, issued on Sep 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Kathryn Amacher, DO located?
The NPPES record lists a practice address at 269 Sage Sparrow Cir, Vacaville, CA, 95687. Phone: (707) 451-4111. Providers update this record themselves, so call before visiting.
How can I verify Kathryn Amacher, DO's license?
NPPES lists California license number 20A5091, 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 Kathryn Amacher, DO prescribe under Medicare Part D?
In 2024, Kathryn Amacher, DO had 15,871 Medicare Part D claims for 527 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. Part D covers Medicare prescriptions only.
What is Kathryn Amacher, DO's MIPS final score?
The 2023 MIPS final score is 67.6 of 100. 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.