Alyssa Marie Grossen, MD
Gastroenterology Physician · Oklahoma City, OK
Alyssa Marie Grossen, MD is a gastroenterology physician with a practice address in Oklahoma City, Oklahoma, and NPI 1912498411, issued on May 21, 2018. Check the license on the Oklahoma Board of Medical Licensure and Supervision; the Medicare figures below come from public CMS files.
- Name
- Alyssa Marie Grossen
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 80523 CT
Self-reported in NPPES; status is on the state search - Practice location
- 3435 NW 56TH St Ste 101, Oklahoma City, OK 73112
- Phone
- (405) 633-9101
- Enumerated
- May 21, 2018
- Record last updated
- Jul 28, 2026
- Fax
- (405) 633-9104
- Medicaid ID
- 207R00000X OK
- Medicare enrollment
- Enrolled (PECOS I20250522003331); accepts Medicare assignment
- Medical or professional school
- University Of Oklahoma College Of Medicine, 2018
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 160 in Oklahoma → Look up another NPI →
Also registered at 3435 NW 56TH St Ste 101
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Abel AbamePharmacist1780260711
- John Maple, DOGastroenterology Physician1902879455
- Yvette Phillips, CNPAcute Care Nurse Practitioner1386185999
- Leith Prise, PHARM.D.Pharmacist1457087330
- Sanjay Sikka, M.D.Gastroenterology Physician1528295698
Verify Alyssa Marie Grossen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOklahoma Board of Medical Licensure and SupervisionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average gastroenterology physician in 2024
63 Medicare Part D claims for 16 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Omeprazole18 claims
- Dicyclomine Hcl13 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: $611.30
5 payments; by number, the most common kind was food and beverage; the largest payer was Medtronic, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 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 one group practice
- Yale UniversityNew Haven, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alyssa Marie Grossen among 160 gastroenterology physician records in Oklahoma
Alyssa Marie Grossen, MD is one of 160 gastroenterology physician records with a practice address in Oklahoma. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 89% of them.
- NPI issued2018 · 89% of these records are older, 8% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2018 · median 2000 among the 106 with a school on file
- Record last updated2026 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Oklahoma practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Oklahoma
There are 160 gastroenterology physician records in Oklahoma.
All 160 in Oklahoma → Every provider in Oklahoma City → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Kirtida Kumar, MDOklahoma City, OK 731121649274374
- John Maple, DOOklahoma City, OK 731121902879455
- Paul Maton, M.D.Oklahoma City, OK 731121538143466
- Matthew McBride, MDOklahoma City, OK 731121871536920
- Mark Mellow, M.D.Oklahoma City, OK 731121366426298
- Don Murray, M.D.Oklahoma City, OK 731121215912787
- Carl Raczkowski, M.D.Oklahoma City, OK 731121851375646
- Robert Rankin, M.D.Oklahoma City, OK 731121174507966
Common questions
What is Alyssa Marie Grossen, MD's NPI number?
Alyssa Marie Grossen, MD's National Provider Identifier (NPI) is 1912498411, issued on May 21, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Alyssa Marie Grossen, MD located?
The NPPES record lists a practice address at 3435 NW 56TH St Ste 101, Oklahoma City, OK, 73112. Phone: (405) 633-9101. Providers update this record themselves, so call before visiting.
How can I verify Alyssa Marie Grossen, MD's license?
Search the Oklahoma Board of Medical Licensure and Supervision at https://www.okmedicalboard.org/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Alyssa Marie Grossen, MD prescribe under Medicare Part D?
In 2024, Alyssa Marie Grossen, MD had 63 Medicare Part D claims for 16 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.