Frederick W. Ruymann, MD
Gastroenterology Physician · Cambridge, MA
Frederick W. Ruymann, MD is a gastroenterology physician with a practice address in Cambridge, Massachusetts, and NPI 1568466316, issued on Jun 9, 2005. Check the license (Massachusetts 71422, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Frederick W. Ruymann
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 71422 MA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Mount Auburn St, Cambridge, MA 02138
- Phone
- (617) 661-0221
- Enumerated
- Jun 9, 2005
- Record last updated
- Jan 11, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (617) 661-3862
- Medicaid ID
- 3052788 MA
- Medicare enrollment
- Enrolled (PECOS I20050406000259); accepts Medicare assignment
- Medical or professional school
- Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University, 1987
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 686 in Massachusetts → Look up another NPI →
Also registered at 300 Mount Auburn St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Julio Ayala, MDGastroenterology Physician1104883347
- Elizabeth Baker, M.D.Obstetrics & Gynecology Physician1659579969
- Paul Bertozzi, MDPulmonary Disease Physician1346312733
Verify Frederick W. Ruymann in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 71422Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% fewer Medicare Part D claims than the average gastroenterology physician in 2024
213 Medicare Part D claims for 99 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 23% of claims.
Most prescribed
- Pantoprazole Sodium33 claims
- Prednisone16 claims
- Famotidine14 claims
- Spironolactone13 claims
- Omeprazole12 claims
- Clenpiq11 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): 79.8 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).
Industry payments in 2024: $1,861.37
67 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie 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
- Medical Affiliates OF Cape Cod IncHarwich, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Frederick W. Ruymann among 686 gastroenterology physician records in Massachusetts
Frederick W. Ruymann, MD is one of 686 gastroenterology physician records with a practice address in Massachusetts. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 86% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1987 · median 2004 among the 491 with a school on file
- Record last updated2012 · 66% 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 Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Massachusetts
There are 686 gastroenterology physician records in Massachusetts.
All 686 in Massachusetts → Every provider in Cambridge → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Julio Ayala, MDCambridge, MA 021381104883347
- Lawrence Borges, M.D.Cambridge, MA 021381043447519
- John Chobanian, M.D.Cambridge, MA 021381518040526
- Samson Ferm, MDCambridge, MA 021381255785713
- Elena Fradkov, M.D.Cambridge, MA 021381326438953
- Torre Morgan, MDCambridge, MA 021381851382360
- Sharon Turissini, MDCambridge, MA 021381407942808
- Karim FawazCambridge, MA 021391952338253
Common questions
What is Frederick W. Ruymann, MD's NPI number?
Frederick W. Ruymann, MD's National Provider Identifier (NPI) is 1568466316, issued on Jun 9, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Frederick W. Ruymann, MD located?
The NPPES record lists a practice address at 300 Mount Auburn St, Cambridge, MA, 02138. Phone: (617) 661-0221. Providers update this record themselves, so call before visiting.
How can I verify Frederick W. Ruymann, MD's license?
NPPES lists Massachusetts license number 71422, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Frederick W. Ruymann, MD prescribe under Medicare Part D?
In 2024, Frederick W. Ruymann, MD had 213 Medicare Part D claims for 99 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Frederick W. Ruymann, MD's MIPS final score?
The 2023 MIPS final score is 79.8 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.