Marissa Kathleen Gruenbaum, PA-C
Physician Assistant · Gahanna, OH
Marissa Kathleen Gruenbaum, PA-C is a physician assistant with a practice address in Gahanna, Ohio, and NPI 1811543861, issued on Aug 15, 2019. Check the license (Ohio 50.005867RX, as entered in NPPES) with the Ohio board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Marissa Kathleen Gruenbaum
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 50.005867RX OH
Self-reported in NPPES; status is on the state search - Practice location
- 605 Crescent PL, Gahanna, OH 43230
- Phone
- (614) 545-7900
- Enumerated
- Aug 15, 2019
- Record last updated
- Jan 9, 2025
- Fax
- (614) 545-7901
- Medicare enrollment
- Enrolled (PECOS I20191212002856); accepts Medicare assignment
- Entity
- Type 1 · individual
Also registered at 605 Crescent PL
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Eissam Alfarraj, PTPhysical Therapist1851053722
- Brian Bare, OTOccupational Therapist1750062774
- Brent Bickel, MDOrthopaedic Hand Surgery Physician1336203645
- Wendy Billings, DPTPhysical Therapist1912487216
- Clinton Boring, DPTPhysical Therapist1881119006
- Alexa Brown, PA-CPhysician Assistant1083901441
Verify Marissa Kathleen Gruenbaum in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Ohio board licenses this profession
Search for license 50.005867RXCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
75% fewer Medicare Part D claims than the average physician assistant in 2024
207 Medicare Part D claims for 164 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. 12 claims were for opioids.
Most prescribed
- Cephalexin23 claims
- Prednisone20 claims
- Meloxicam16 claims
- Nitrofurantoin Mono-Macro16 claims
- Ondansetron Odt16 claims
- Cefuroxime14 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 practice group's MIPS final score for 2023 (Medicare payment program): 52.9 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Orthopedic One, Inc.Upper Arlington, OH
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
26 physician assistant records list a practice address in Gahanna
They are 26 of the 995 NPPES records with a practice address in Gahanna, and 5,325 physician assistant records in Ohio.
All 26 in Gahanna → All 5,325 in Ohio → Every provider in Gahanna →
Other physician assistant records in Ohio
- Ali Abady, PA-CWesterville, OH1790268795
- Kristin Abbruzzi, PAColumbus, OH1548228018
- Nadia Abdallah, PA-CElyria, OH1669839874
- Sarah Abdallah, PA-CCenterville, OH1730446162
- Muhammad AbdelhameedToledo, OH1346104668
- Tony Abdulkarim, PA-CCleveland, OH1750772711
- Krislyn Aberegg, PA-CCleveland, OH1093233082
- Jennie Abernathy, PACleveland, OH1255003398
- Bethany Abernethy, PACincinnati, OH1235566548
- Molly Abourezk, PA-CCincinnati, OH1306330006
Common questions
What is Marissa Kathleen Gruenbaum, PA-C's NPI number?
Marissa Kathleen Gruenbaum, PA-C's National Provider Identifier (NPI) is 1811543861, issued on Aug 15, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Marissa Kathleen Gruenbaum, PA-C located?
The NPPES record lists a practice address at 605 Crescent PL, Gahanna, OH, 43230. Phone: (614) 545-7900. Providers update this record themselves, so call before visiting.
How can I verify Marissa Kathleen Gruenbaum, PA-C's license?
NPPES lists Ohio license number 50.005867RX, as entered by the provider. Search the Ohio board that licenses this profession; the NPPES record confirms identity only.
How much does Marissa Kathleen Gruenbaum, PA-C prescribe under Medicare Part D?
In 2024, Marissa Kathleen Gruenbaum, PA-C had 207 Medicare Part D claims for 164 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
What is Marissa Kathleen Gruenbaum, PA-C's MIPS final score?
The 2023 MIPS final score is 52.9 of 100, reported for the practice group. 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.