James A. Katz, M.D.
Internal Medicine Physician · Portland, ME
James A. Katz, M.D. is an internal medicine physician with a practice address in Portland, Maine, and NPI 1588605604, issued on Jun 9, 2006. Check the license (Maine 015107, as entered in NPPES) on the Maine Board of Licensure in Medicine; the Medicare figures below come from public CMS files.
- Name
- James A. Katz
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 015107 ME
Self-reported in NPPES; status is on the state search - Practice location
- 144 State St, Portland, ME 04101
- Phone
- (207) 879-3040
- Enumerated
- Jun 9, 2006
- Record last updated
- Jul 13, 2026
- Medicare enrollment
- Enrolled (PECOS I20040406000168); accepts Medicare assignment
- Medical or professional school
- University Of Vermont College Of Medicine, 1996
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 597 in Maine → Look up another NPI →
Also registered at 144 State St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- David Andrews, M.D.Anesthesiology Physician1861429268
- Sandra Aubelangella, CNSPsychiatric/Mental Health Nurse Practitioner1306883129
- Mary Louise Bates, M.D.Anesthesiology Physician1427035666
- Normand Begin, CRNACertified Registered Nurse Anesthetist1235186412
- Denise BenedictPhysician Office Based Coding Specialist1487907978
Verify James A. Katz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaine Board of Licensure in Medicine
Search for license 015107Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.5 times the Medicare Part D claims of the average internal medicine physician in 2024
11,177 Medicare Part D claims for 758 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 326 claims were for opioids.
Most prescribed
- Atorvastatin Calcium676 claims
- Amlodipine Besylate590 claims
- Lisinopril553 claims
- Omeprazole392 claims
- Levothyroxine Sodium311 claims
- Gabapentin291 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 one group practice
- Mercy HospitalPortland, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James A. Katz among 597 internal medicine physician records in Maine
James A. Katz, M.D. is one of 597 internal medicine physician records with a practice address in Maine. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 44% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1996 · median 2005 among the 369 with a school on file
- Record last updated2026 · 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 207R00000X and a Maine practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
145 internal medicine physician records list a practice address in Portland
They are 145 of the 6,022 NPPES records with a practice address in Portland, and 597 internal medicine physician records in Maine.
All 597 in Maine → Every provider in Portland → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Joel Botler, MDPortland, ME 041011891764577
- Charles Cathcart, MDPortland, ME 041011861461535
- Wendy Cathcart, MDPortland, ME 041011295704971
- Thomas Claffey, MDPortland, ME 041011487623153
- Steven Dobieski, MDPortland, ME 041011942279617
- John Erickson, MDPortland, ME 041011043289713
- Debra Fuchs Ertman, MDPortland, ME 041011730158403
- Phyllidia Ku-Ruth, MDPortland, ME 041011497724108
Common questions
What is James A. Katz, M.D.'s NPI number?
James A. Katz, M.D.'s National Provider Identifier (NPI) is 1588605604, issued on Jun 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James A. Katz, M.D. located?
The NPPES record lists a practice address at 144 State St, Portland, ME, 04101. Phone: (207) 879-3040. Providers update this record themselves, so call before visiting.
How can I verify James A. Katz, M.D.'s license?
NPPES lists Maine license number 015107, 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 A. Katz, M.D. prescribe under Medicare Part D?
In 2024, James A. Katz, M.D. had 11,177 Medicare Part D claims for 758 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.
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.