Marissa Williams, PA-C
Physician Assistant · Zephyrhills, FL
Marissa Williams, PA-C is a physician assistant with a practice address in Zephyrhills, Florida, and NPI 1851688873, issued on Jun 29, 2011. Check the license (Florida PA9106109, as entered in NPPES) on the Florida health license search; the Medicare figures below come from public CMS files.
- Name
- Marissa Williams
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- PA9106109 FL
Self-reported in NPPES; status is on the state search - Practice location
- 7213 Green Slope Dr, Zephyrhills, FL 33541
- Phone
- (813) 355-4914
- Enumerated
- Jun 29, 2011
- Record last updated
- Jun 16, 2026
- Fax
- (855) 547-5415
- Medicare enrollment
- Enrolled (PECOS I20121015000011); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 10,257 in Florida → Look up another NPI →
Also registered at 7213 Green Slope Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Harry Blackstone, DOFamily Medicine Physician1720016496
- Roland McKendree, ARNPFamily Nurse Practitioner1841639945
- Joseph Nystrom, MDFamily Medicine Physician1629006127
- Calvin Zhang, PA-CPhysician Assistant1013744051
Verify Marissa Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersFlorida health license search
Search for license PA9106109Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
6.4 times the Medicare Part D claims of the average physician assistant in 2024
5,344 Medicare Part D claims for 389 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Levothyroxine Sodium289 claims
- Atorvastatin Calcium217 claims
- Amlodipine Besylate191 claims
- Rosuvastatin Calcium190 claims
- Losartan Potassium173 claims
- Lisinopril142 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.
Industry payments in 2024: $706.62
39 payments; by number, the most common kind was food and beverage; the largest payer was Lilly USA, LLC. The 64,719 providers of this specialty with any payment received $841.65 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Legacy Healthcare Services IncTampa, FL
- Zephyrhills Family Practice And Geriatric Care LLCZephyrhills, FL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marissa Williams among 10,257 physician assistant records in Florida
Marissa Williams, PA-C is one of 10,257 physician assistant records with a practice address in Florida. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 28% of them.
- NPI issued2011 · 28% of these records are older, 70% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2011 · median 2018 among the 5,867 with a school on file
- Record last updated2026 · 37% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Florida practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
31 physician assistant records list a practice address in Zephyrhills
They are 31 of the 851 NPPES records with a practice address in Zephyrhills, and 10,257 physician assistant records in Florida.
All 10,257 in Florida → Every provider in Zephyrhills → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Edwin Czovek, PHYS ASSISTANTZephyrhills, FL 335411891867396
- Katheryn Hassey, PA-CZephyrhills, FL 335411669017083
- Julia Jones, PA-CZephyrhills, FL 335411861963761
- Maryam Mumtaz, PA-CZephyrhills, FL 335411962223149
- Olivia Pellissier, PA-CZephyrhills, FL 335411730961491
- Calvin Zhang, PA-CZephyrhills, FL 335411013744051
- Rana Amer, PA-CZephyrhills, FL 335421255669297
- Niti Amin, PA-CZephyrhills, FL 335421114356573
Common questions
What is Marissa Williams, PA-C's NPI number?
Marissa Williams, PA-C's National Provider Identifier (NPI) is 1851688873, issued on Jun 29, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Marissa Williams, PA-C located?
The NPPES record lists a practice address at 7213 Green Slope Dr, Zephyrhills, FL, 33541. Phone: (813) 355-4914. Providers update this record themselves, so call before visiting.
How can I verify Marissa Williams, PA-C's license?
NPPES lists Florida license number PA9106109, as entered by the provider. Search the Florida health license search at https://mqa-internet.doh.state.fl.us/mqasearchservices/healthcareproviders. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marissa Williams, PA-C prescribe under Medicare Part D?
In 2024, Marissa Williams, PA-C had 5,344 Medicare Part D claims for 389 beneficiaries; the average among physician assistant prescribers was 830. 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.