NPPES file of Aug 9, 2026

Nicholas M. Grumbach, M.D.

Internal Medicine Physician · Warwick, RI

Nicholas M. Grumbach, M.D. is an internal medicine physician with a practice address in Warwick, Rhode Island, and NPI 1932105780, issued on Jun 27, 2005. Check the license (Rhode Island MD10410, as entered in NPPES) on the Rhode Island Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1932105780
Name
Nicholas M. Grumbach
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
MD10410 RI
Self-reported in NPPES; status is on the state search
Practice location
400 Bald Hill RD, Warwick, RI 02886
Phone
(401) 793-8520
Enumerated
Jun 27, 2005
Record last updated
Sep 30, 2015 (not updated in 11 years: call before relying on the address or phone)
Fax
(401) 793-8527
Medicaid IDs
2067650 MA
WG33264 RI
Medicare enrollment
Enrolled (PECOS I20040316000037); accepts Medicare assignment
Medical or professional school
Icahn School Of Medicine At Mount Sinai, 1996
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 1,033 in Rhode Island → Look up another NPI →

Also registered at 400 Bald Hill RD

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Scott Bessette, LMHCMental Health Counselor1417108523
  2. Joseph BlanchardHearing Instrument Specialist1548646045
  3. Tara Bogs, PH.D.Clinical Psychologist1043385081
  4. Kalina Brabeck, PH.D.Counseling Psychologist1417109232
  5. Amber Champagne, PSYDClinical Psychologist1073245940
  6. Irene Chliwner, MDInternal Medicine Physician1588745491

Verify Nicholas M. Grumbach in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersRhode Island Board of Medical Licensure and Discipline
    Search for license MD10410    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Rhode Island license search

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89% fewer Medicare Part D claims than the average internal medicine physician in 2024

341 Medicare Part D claims for 53 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.

  1. Nicholas Grumbach341
  2. Specialty average3,176

Most prescribed

  1. Amlodipine Besylate19 claims
  2. Tamsulosin Hcl19 claims
  3. Atorvastatin Calcium16 claims
  4. Metformin Hcl16 claims
  5. Mirtazapine15 claims
  6. Pantoprazole Sodium15 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.

One hospital affiliation

  1. Rhode Island HospitalProvidence, RI · Acute Care Hospitals4 of 5 stars

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.

Nicholas M. Grumbach among 1,033 internal medicine physician records in Rhode Island

Nicholas M. Grumbach, M.D. is one of 1,033 internal medicine physician records with a practice address in Rhode Island. 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, 90% newer
  • In a Medicare fileYes · 80% of these records are
  • In the CMS Doctors and Clinicians fileYes · 57% of these records are
  • Graduated1996 · median 2006 among the 590 with a school on file
  • Record last updated2015 · 48% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Rhode Island practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

120 internal medicine physician records list a practice address in Warwick

They are 120 of the 2,776 NPPES records with a practice address in Warwick, and 1,033 internal medicine physician records in Rhode Island.

All 1,033 in Rhode Island → Every provider in Warwick → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. John Audett, MDWarwick, RI 028861609872878
  2. Amy Boyer, M.D.Warwick, RI 028861346215357
  3. Patricia Chace, MDWarwick, RI 028861285634535
  4. Wilfredo Curioso, M.D.Warwick, RI 028861518932565
  5. Mechery Davis, MDWarwick, RI 028861407824477
  6. Robert Ellison, M.D.Warwick, RI 028861083610836
  7. Neal Galinko, M.D.Warwick, RI 028861508862350
  8. Robert Hance, MDWarwick, RI 028861144283276

Common questions

What is Nicholas M. Grumbach, M.D.'s NPI number?

Nicholas M. Grumbach, M.D.'s National Provider Identifier (NPI) is 1932105780, issued on Jun 27, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Nicholas M. Grumbach, M.D. located?

The NPPES record lists a practice address at 400 Bald Hill RD, Warwick, RI, 02886. Phone: (401) 793-8520. Providers update this record themselves, so call before visiting.

How can I verify Nicholas M. Grumbach, M.D.'s license?

NPPES lists Rhode Island license number MD10410, as entered by the provider. Search the Rhode Island Board of Medical Licensure and Discipline at https://healthri.mylicense.com/Verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Nicholas M. Grumbach, M.D. prescribe under Medicare Part D?

In 2024, Nicholas M. Grumbach, M.D. had 341 Medicare Part D claims for 53 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.