NPPES file of Aug 9, 2026

James McIlhenny Riddleberger, M.D.

Family Medicine Physician · Portland, ME

James McIlhenny Riddleberger, M.D. is a family medicine physician with a practice address in Portland, Maine, and NPI 1114308277, issued on Jun 15, 2015. Check the license (Maine MD22299, as entered in NPPES) on the Maine Board of Licensure in Medicine; 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
1114308277
Name
James McIlhenny Riddleberger
Credential
M.D.
Primary taxonomy
Family Medicine Physician 207Q00000X
License number
MD22299 ME
Self-reported in NPPES; status is on the state search
Practice location
331 Veranda St, Portland, ME 04103
Phone
(207) 828-2402
Enumerated
Jun 15, 2015
Record last updated
Oct 1, 2020 (not updated in 6 years: call before relying on the address or phone)
Fax
(207) 828-2425
Medicare enrollment
Enrolled (PECOS I20180803000734); may accept Medicare assignment
Medical or professional school
Tulane University School Of Medicine, 2015
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 family medicine physician records → All 1,172 in Maine → Look up another NPI →

Also registered at 331 Veranda St

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

  1. Jeffrey Benson, M.D.Family Medicine Physician1992827851
  2. Beth Brausch, OTOccupational Therapist1356528301
  3. Steven Brewster, MDFamily Medicine Physician1497851307
  4. Cathra Chappelle, MDFamily Medicine Physician1912957069
  5. Patrick Connolly, MDFamily Medicine Physician1982655098
  6. Douglas Couper, MDInternal Medicine Physician1154371243

Verify James McIlhenny Riddleberger in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMaine Board of Licensure in Medicine
    Search for license MD22299    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 Maine license search

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19% more Medicare Part D claims than the average family medicine physician in 2024

4,204 Medicare Part D claims for 409 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 95 claims were for opioids.

  1. James Riddleberger4,204
  2. Specialty average3,544

Most prescribed

  1. Atorvastatin Calcium375 claims
  2. Lisinopril194 claims
  3. Amlodipine Besylate136 claims
  4. Gabapentin127 claims
  5. Metoprolol Succinate117 claims
  6. Losartan Potassium114 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.

Bills Medicare through 2 group practices

  1. Martin's Point Health Care, Inc.Portland, ME
  2. Riverview Physical Therapy Limited PartnershipYarmouth, ME

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

James McIlhenny Riddleberger among 1,172 family medicine physician records in Maine

James McIlhenny Riddleberger, M.D. is one of 1,172 family medicine physician records with a practice address in Maine. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 74% of them.

  • NPI issued2015 · 74% of these records are older, 23% newer
  • In a Medicare fileYes · 76% of these records are
  • In the CMS Doctors and Clinicians fileYes · 57% of these records are
  • Graduated2015 · median 2008 among the 668 with a school on file
  • Record last updated2020 · 60% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Maine practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

89 family medicine physician records list a practice address in Portland

They are 89 of the 6,022 NPPES records with a practice address in Portland, and 1,172 family medicine physician records in Maine.

All 1,172 in Maine → Every provider in Portland → Family Medicine Physician nationwide →

The 8 family medicine physician records with the nearest ZIP codes

  1. Christopher Bartlett, M.D.Portland, ME 041031083656961
  2. Steven Brewster, MDPortland, ME 041031497851307
  3. Cathra Chappelle, MDPortland, ME 041031912957069
  4. Patrick Connolly, MDPortland, ME 041031982655098
  5. Richard Entel, MDPortland, ME 041031760418990
  6. James Harper, MDPortland, ME 041031245286129
  7. Lewis Holmes, MDPortland, ME 041031649269184
  8. David Howes, MDPortland, ME 041031407802382

Common questions

What is James McIlhenny Riddleberger, M.D.'s NPI number?

James McIlhenny Riddleberger, M.D.'s National Provider Identifier (NPI) is 1114308277, issued on Jun 15, 2015. An NPI identifies a provider in billing; it is not a license.

Where is James McIlhenny Riddleberger, M.D. located?

The NPPES record lists a practice address at 331 Veranda St, Portland, ME, 04103. Phone: (207) 828-2402. Providers update this record themselves, so call before visiting.

How can I verify James McIlhenny Riddleberger, M.D.'s license?

NPPES lists Maine license number MD22299, as entered by the provider. Search the Maine Board of Licensure in Medicine at https://www.maine.gov/md/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does James McIlhenny Riddleberger, M.D. prescribe under Medicare Part D?

In 2024, James McIlhenny Riddleberger, M.D. had 4,204 Medicare Part D claims for 409 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.