Katherine R. Caldwell, MD
Internal Medicine Physician · Portland, ME
Katherine R. Caldwell, MD is an internal medicine physician with a practice address in Portland, Maine, and NPI 1730257411, issued on Dec 1, 2006. Check the license (Maine MD17709, as entered in NPPES) on the Maine Board of Licensure in Medicine; the Medicare figures below come from public CMS files.
- Name
- Katherine R. Caldwell
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- MD17709 ME
017709 ME
EC05076 ME
55033 MN
Self-reported in NPPES; status is on the state search - Practice location
- 84 Marginal Way, Portland, ME 04101
- Phone
- (207) 774-5816
- Enumerated
- Dec 1, 2006
- Record last updated
- Mar 4, 2026
- Fax
- (207) 523-8597
- Medicaid ID
- 432856099 ME
- Medicare enrollment
- Enrolled (PECOS I20080321000037); accepts Medicare assignment
- Medical or professional school
- University Of Massachusetts Medical School, 2004
- 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 84 Marginal Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Katherine R. Caldwell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaine Board of Licensure in Medicine
Search for license MD17709Check 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 internal medicine physician in 2024
811 Medicare Part D claims for 390 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 51 claims were for opioids.
Most prescribed
- Prednisone35 claims
- Gabapentin31 claims
- Levothyroxine Sodium26 claims
- Atorvastatin Calcium25 claims
- Lorazepam25 claims
- Rosuvastatin Calcium25 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
- Intermed PAPortland, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katherine R. Caldwell among 597 internal medicine physician records in Maine
Katherine R. Caldwell, MD 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
- Graduated2004 · 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 Katherine R. Caldwell, MD's NPI number?
Katherine R. Caldwell, MD's National Provider Identifier (NPI) is 1730257411, issued on Dec 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Katherine R. Caldwell, MD located?
The NPPES record lists a practice address at 84 Marginal Way, Portland, ME, 04101. Phone: (207) 774-5816. Providers update this record themselves, so call before visiting.
How can I verify Katherine R. Caldwell, MD's license?
NPPES lists Maine license number MD17709, 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 Katherine R. Caldwell, MD prescribe under Medicare Part D?
In 2024, Katherine R. Caldwell, MD had 811 Medicare Part D claims for 390 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.