Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

James A Katz, MD

Individual provider Internal Medicine Physician · NPI 1588605604

James A Katz, MD practises Internal Medicine in Portland, Maine. Graduated from University of Vermont College of Medicine in 1996, 30 years ago. Practices with Mercy Hospital, a 308-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Maine.

Years since qualifying
30
Trained at
University of Vermont College of Medicine
Licensed in
ME
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

144 State St
Portland, ME 04101-3776
Phone: (207) 879-3040
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 015107 (ME)

Record details

NPI number1588605604
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 9, 2006
Last updated in NPPESJuly 13, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF VERMONT COLLEGE OF MEDICINE
Graduated 1996 (30 years in practice)
Group practice Mercy Hospital — 308 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations5 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients263
Services billed 584 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Mainehealth Maine Medical Center Hospital · Portland, ME · listed as Maine Medical Center
  • Mainehealth Mid Coast Hospital Hospital · Brunswick, ME
  • Northern Light Mercy Hospital Hospital · Portland, ME
  • Amedisys Home Health Home health agency · Portland, ME
  • Northern Light Home Care & Hospice Home health agency · So Portland, ME
  • Andwell Health Partners Hospice · Scarborough, ME
  • Northern Light Home Care & Hospice Hospice · South Portland, ME

Colleagues at Mercy Hospital

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 308 clinicians in the practice; 12 are shown here.

Other providers in Portland