Stephen Kotarek, PA
- Part D claims, 2024
- 606
- Affiliated sites
- 2
- Medical groups
- 4
- State license
- 1
- Year NPI issued
- 2009
- Practice address
- 1000 Nut Tree Rd, Vacaville, CA 95687
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Northbay Vacavalley Hospital - HOPD
Acute Care Hospital outpatient department · Vacaville, California
Find Stephen Kotarek'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.
Stephen Kotarek is a physician assistant in Vacaville, California
Stephen Kotarek practices at Northbay Vacavalley Hospital - HOPD in Vacaville, California.
Stephen Kotarek's NPI, 1235371915, was assigned on March 27, 2009. Stephen Kotarek holds California license PA19292.
- NPI
- 1235371915NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6406099290
- NPI enumeration date
- March 27, 2009
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 45
- Medical school graduation
- 2007
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Stephen Kotarek practices at Northbay Vacavalley Hospital - HOPD in Vacaville, California
Stephen Kotarek's primary practice is Northbay Vacavalley Hospital - HOPD, at 1000 Nut Tree Rd, Vacaville, CA 95687.
- Northbay Vacavalley Hospital - HOPD1000 Nut Tree Rd, Vacaville, CA 95687
Source: Dmand AI Affiliation Data
Stephen Kotarek is affiliated with 2 sites of care and 4 medical groups
Stephen Kotarek's primary practice is Northbay Vacavalley Hospital - HOPD in Vacaville, California. The medical group on file is NorthBay Medical Center. Dmand AI also links Stephen Kotarek to 3 more medical groups and 1 group practice or clinic, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Stephen Kotarek's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Stephen Kotarek practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Northbay Vacavalley Hospital - HOPD | Available with a free account |
| +1 more site and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Stephen Kotarek is one of 2,381 physician assistants in California
Medical is Stephen Kotarek's primary specialty in the NPI Registry, under taxonomy code 363AM0700X. Stephen Kotarek is board certified in certified physician assistant by the National Commission on Certification of Physician Assistants (NCCPA). Stephen Kotarek is licensed in California.
Specialties and state licenses
- Medical physician assistant, CaliforniaPrimary
Physician assistants near Stephen Kotarek
Counts of physician assistants 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
Stephen Kotarek's patients have a median age of 35
Across all payers, Dmand AI patient panel data puts Stephen Kotarek's median patient age at 35, with 54% women.
Stephen Kotarek's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 35
Patient panel by sex, all payers
- Women54%
- Men45%
Source: Dmand AI Patient Panel Data
Stephen Kotarek wrote 606 Medicare Part D claims in 2024
In 2024, Stephen Kotarek wrote 606 Medicare Part D claims for 72 patients. 89% of them were for generic drugs. CMS names the drug for 442 of them, across 21 drugs with 11 or more claims each, at $156,883 in total drug cost.
Stephen Kotarek's Part D claims by kind of drug, 2024
- Generic537 claims89%
- Brand-name69 claims11%
Stephen Kotarek's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Stephen Kotarek's Part D claims, 2024
- Antipsychotics, patients 65 and over8%49 of 606 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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
How Stephen Kotarek takes part in Medicare
Stephen Kotarek accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Stephen Kotarek is board certified in certified physician assistant
- Board certified in certified physician assistant
Source: Dmand AI Professional Profile Data
Sources for Stephen Kotarek'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 Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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) |
| 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 Stephen Kotarek
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Stephen Kotarek's NPI number?
Stephen Kotarek's NPI number is 1235371915. It was assigned on March 27, 2009, and it is active in the NPI Registry.
What does Stephen Kotarek specialize in?
Stephen Kotarek is a physician assistant in Vacaville, California. The primary specialty in the NPI Registry is Medical Physician Assistant (taxonomy code 363AM0700X).
Where does Stephen Kotarek practice?
Stephen Kotarek practices at 1000 Nut Tree Rd, Vacaville, CA 95687. Stephen Kotarek's primary practice is Northbay Vacavalley Hospital - HOPD in Vacaville, California. Dmand AI also links Stephen Kotarek to 3 medical groups and 1 group practice or clinic.
What is Stephen Kotarek's medical license number?
Stephen Kotarek holds California license PA19292.
What medical group is Stephen Kotarek part of?
Stephen Kotarek is linked to NorthBay Medical Center. Dmand AI links Stephen Kotarek to 3 more medical groups.
Does Stephen Kotarek accept Medicare?
Yes. CMS lists Stephen Kotarek as accepting Medicare assignment.
Is Stephen Kotarek board certified?
Yes. Stephen Kotarek is board certified in certified physician assistant by the National Commission on Certification of Physician Assistants (NCCPA).
What drugs does Stephen Kotarek prescribe most?
In 2024 Medicare Part D data, Stephen Kotarek's most prescribed drugs by claims were Quetiapine Fumarate, Lamotrigine and Prazosin HCl.
How long has Stephen Kotarek been practicing?
Stephen Kotarek graduated from medical school in 2007, 19 years ago.
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