Dr. Mitchell C. Marubayashi, DO
- Medicare services, 2024
- 13
- Medicare patients, 2024
- 29
- Part D claims, 2024
- 17
- MIPS score, 2024
- 88
- Hospital affiliations
- 4
- Practice address
- 1 Quality Drive, Vacaville, CA 95688
- Practice phone
- Call (707) 624-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Marubayashi's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Mitchell C. Marubayashi is a family medicine physician in Vacaville, California
Dr. Marubayashi practices at Vacaville Medical Center in Vacaville, California, part of Kaiser Permanente.
Dr. Marubayashi's NPI, 1093208779, was assigned on June 7, 2018. Dr. Marubayashi graduated from Kansas City University of Medicine and Biosciences College of Osteopathic Medicine in 2018. Dr. Marubayashi holds California license 20A17557.
- NPI
- 1093208779NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8820490196
- NPI enumeration date
- June 7, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (707) 624-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mitchell C. Marubayashi practices at Vacaville Medical Center in Vacaville, California
Dr. Marubayashi's primary practice is Vacaville Medical Center, at 1 Quality Drive, Vacaville, CA 95688 in Solano County. The practice phone is (707) 624-4000.
- Vacaville Medical Center1 Quality Drive, Vacaville, CA 95688 · Solano CountyPhone(707) 624-4000
Source: Dmand AI Affiliation Data
Dr. Mitchell C. Marubayashi is affiliated with 6 sites of care and 4 medical groups
Dr. Marubayashi's primary practice is Vacaville Medical Center in Vacaville, California, part of Kaiser Permanente. Dr. Marubayashi is also affiliated with Enloe Health. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Marubayashi to 2 more hospitals, 3 medical groups, 1 clinical lab and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mitchell C. Marubayashi's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marubayashi practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Vacaville Medical Center | Available with a free account |
| +5 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mitchell C. Marubayashi is one of 15,680 family medicine physicians in California
Family medicine is Dr. Marubayashi's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Marubayashi is board certified in family medicine by the American Board of Family Medicine. Dmand AI has Dr. Marubayashi's licenses on file in 2 states: California and Washington.
Specialties and state licenses
- Family medicine, CaliforniaPrimary
- Washington license
Clinical focus
Dmand AI lists acute diabetes, atrial fibrillation and flutter, cardiac arrhythmia, cellulitis, chronic diabetes, chronic hypertension, chronic obstructive pulmonary disease (COPD) and collapsed lung among the conditions Dr. Marubayashi treats.
Family medicine physicians near Dr. Marubayashi
Counts of family medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mitchell C. Marubayashi billed Medicare for 13 services in 2024
CMS data shows 13 Medicare services from Dr. Marubayashi across 1 procedure code in 2024, for 29 Medicare patients. Medicare paid $1,718 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Marubayashi's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3362024: 1396%
- Tests and treatments
- 2023: 122024: 0100%
Dr. Marubayashi compared with the California median for family medicine physicians, 2024
- Dr. Marubayashi
- California median
- Medicare services
- 13vs 24695% below
- Medicare patients
- 29vs 11875% below
- Part D claims
- 27vs 83397% below
Medians across 15,349 family medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Marubayashi's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mitchell C. Marubayashi treated 29 Medicare patients in 2024, average age 76
CMS counts 29 Medicare patients who saw Dr. Marubayashi in 2024. 75% of them have high blood pressure, and 75% have high cholesterol. 52% are also on Medicaid. Their average risk score is 2.41, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Marubayashi's median patient age at 66, with 46% women.
Dr. Marubayashi's Medicare patients by sex, 2024
- Women1759%
- Men1241%
Chronic conditions among Dr. Marubayashi's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis59%
- Chronic kidney disease41%
- Diabetes41%
- COPD38%
- Mood disorders38%
Share of Medicare patients with each condition. A patient can have several.
Dr. Marubayashi's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women46%
- Men54%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mitchell C. Marubayashi wrote 17 Medicare Part D claims in 2024
In 2024, Dr. Marubayashi wrote 17 Medicare Part D claims for 12 patients. 82% of them were for generic drugs. They cover 2 drugs, with $107 in total drug cost. In 2021, CMS named 55 claims across 3 drugs.
Dr. Marubayashi's Part D claims by kind of drug, 2024
- Generic14 claims82%
- Brand-name and other3 claims18%
Dr. Marubayashi's most prescribed drugs by claims, 2022
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 552022: 2751%
Drugs named by CMS: 2 in 2022, 3 in 2021.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Mitchell C. Marubayashi scored 88 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 88 out of 100 for Dr. Marubayashi for performance year 2024, reported as part of a group. Dr. Marubayashi accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Marubayashi's MIPS scores, performance year 2024
- 88of 100Final score
- 77.6of 100Quality
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Mitchell C. Marubayashi graduated from Kansas City University of Medicine and Biosciences College of Osteopathic Medicine
Dr. Marubayashi graduated from Kansas City University of Medicine and Biosciences College of Osteopathic Medicine in 2018.
- Medical school
- Board certified in family medicine
Source: Dmand AI Professional Profile Data
Sources for Dr. Mitchell C. Marubayashi's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Mitchell C. Marubayashi
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mitchell C. Marubayashi's NPI number?
Dr. Mitchell C. Marubayashi's NPI number is 1093208779. It was assigned on June 7, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. Mitchell C. Marubayashi?
Dr. Mitchell C. Marubayashi is a family medicine physician in Vacaville, California. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Mitchell C. Marubayashi practice?
Dr. Marubayashi practices at 1 Quality Drive, Vacaville, CA 95688. Dr. Marubayashi's primary practice is Vacaville Medical Center in Vacaville, California, part of Kaiser Permanente. Dmand AI also links Dr. Marubayashi to 2 hospitals, 3 medical groups, 1 clinical lab and 1 group practice or clinic.
What is Dr. Mitchell C. Marubayashi's office phone number?
The practice phone on file for Dr. Marubayashi is (707) 624-4000.
What is Dr. Mitchell C. Marubayashi's medical license number?
Dr. Marubayashi holds California license 20A17557, one of the licenses on file in 2 states.
Which states has Dr. Mitchell C. Marubayashi been licensed in?
Dmand AI has state licenses on file for Dr. Marubayashi in California (2019 to 2027) and Washington (2023).
Which hospitals is Dr. Mitchell C. Marubayashi affiliated with?
Dr. Marubayashi practices at Vacaville Medical Center in Vacaville, California. Dr. Marubayashi is also affiliated with Enloe Health. Dmand AI links Dr. Marubayashi to 2 more hospitals.
What medical group is Dr. Mitchell C. Marubayashi part of?
Dr. Marubayashi is linked to The Permanente Medical Group, Inc. Dmand AI links Dr. Marubayashi to 3 more medical groups.
Does Dr. Mitchell C. Marubayashi accept Medicare?
Yes. CMS data shows Dr. Marubayashi billed Medicare for 13 services in 2024, and Dr. Marubayashi accepts Medicare assignment.
What is Dr. Mitchell C. Marubayashi's MIPS score?
Dr. Marubayashi's MIPS final score for performance year 2024 is 88 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Mitchell C. Marubayashi see?
CMS counts 29 Medicare patients who saw Dr. Marubayashi in 2024, with an average age of 76.
Is Dr. Mitchell C. Marubayashi board certified?
Yes. Dr. Marubayashi is board certified in family medicine by the American Board of Family Medicine.
What services does Dr. Mitchell C. Marubayashi bill to Medicare?
In 2024, Dr. Marubayashi's most billed Medicare services were emergency department visit (99285).
Where did Dr. Mitchell C. Marubayashi go to medical school?
Dr. Marubayashi graduated from Kansas City University of Medicine and Biosciences College of Osteopathic Medicine in 2018.
What drugs does Dr. Mitchell C. Marubayashi prescribe most?
In 2022 Medicare Part D data, Dr. Marubayashi's most prescribed drugs by claims were Losartan Potassium and Hydrochlorothiazide.
How long has Dr. Mitchell C. Marubayashi been practicing?
Dr. Marubayashi graduated from medical school in 2018, 8 years ago.
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