Mariko Feuz, DO
Hospice and Palliative Medicine (Internal Medicine) Physician · Walnut Creek, CA
Mariko Feuz, DO is a hospice and palliative medicine (internal medicine) physician with a practice address in Walnut Creek, California, and NPI 1912575853, issued on Jun 16, 2021. Check the license (California 20A22735, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mariko Feuz
- Credential
- DO
- Primary taxonomy
- Hospice and Palliative Medicine (Internal Medicine) Physician 207RH0002X
- License number
- 20A22735 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1450 Treat Blvd Ste 120A, Walnut Creek, CA 94597
- Phone
- (925) 296-9720
- Enumerated
- Jun 16, 2021
- Record last updated
- Sep 24, 2025
- Medicare enrollment
- Enrolled (PECOS I20251009003306); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hospice and palliative medicine (internal medicine) physician records → All 260 in California → Look up another NPI →
Also registered at 1450 Treat Blvd Ste 120A
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Zachary Johnston, NPAdult Health Nurse Practitioner1730075623
- Levy Jo Manuntag, MDHospice and Palliative Medicine (Internal Medicine) Physician1932696846
Verify Mariko Feuz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A22735Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average hospice and palliative medicine (internal medicine) physician in 2024
76 Medicare Part D claims for 11 beneficiaries, against an average of 741 among the 1,607 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of 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
- John Muir Physician NetworkWalnut Creek, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mariko Feuz among 260 hospice and palliative medicine (internal medicine) physician records in California
Mariko Feuz, DO is one of 260 hospice and palliative medicine (internal medicine) physician records with a practice address in California. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 93% of them.
- NPI issued2021 · 93% of these records are older, 2% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated2021 · median 2010 among the 193 with a school on file
- Record last updated2025 · 38% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0002X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospice and Palliative Medicine (Internal Medicine) Physician providers in California
There are 260 hospice and palliative medicine (internal medicine) physician records in California.
All 260 in California → Every provider in Walnut Creek → Hospice and Palliative Medicine (Internal Medicine) Physician nationwide →
The 8 hospice and palliative medicine (internal medicine) physician records with the nearest ZIP codes
- Levy Jo Manuntag, MDWalnut Creek, CA 945971932696846
- Shabnam Yekta, M.D.Walnut Creek, CA 945971932513744
- Natalia Zielkiewicz, M.D.Walnut Creek, CA 945971033272729
- Donna Foliart, M.D.Walnut Creek, CA 945981205051687
- Aliya Gessling, M.D.Walnut Creek, CA 945961912389149
- Sandra Karpenko, M.D.Walnut Creek, CA 945951780745281
- Fallon Bushee, MDOakland, CA 946021750918769
- Faren ClumOakland, CA 946021639565773
Common questions
What is Mariko Feuz, DO's NPI number?
Mariko Feuz, DO's National Provider Identifier (NPI) is 1912575853, issued on Jun 16, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Mariko Feuz, DO located?
The NPPES record lists a practice address at 1450 Treat Blvd Ste 120A, Walnut Creek, CA, 94597. Phone: (925) 296-9720. Providers update this record themselves, so call before visiting.
How can I verify Mariko Feuz, DO's license?
NPPES lists California license number 20A22735, 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 Mariko Feuz, DO prescribe under Medicare Part D?
In 2024, Mariko Feuz, DO had 76 Medicare Part D claims for 11 beneficiaries; the average among hospice and palliative medicine (internal medicine) physician prescribers was 741. 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.