Mercedes Lim Ang, M.D.
Internal Medicine Physician · Ellsworth, ME
Mercedes Lim Ang, M.D. is an internal medicine physician with a practice address in Ellsworth, Maine, and NPI 1033341813, issued on Aug 13, 2009. Check the license (Maine MD19406, as entered in NPPES) on the Maine Board of Licensure in Medicine; the Medicare figures below come from public CMS files.
- Name
- Mercedes Lim Ang
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- MD19406 ME
MT194315 PA
Self-reported in NPPES; status is on the state search - Practice location
- 50 Union St, Ellsworth, ME 04605
- Phone
- (207) 664-5311
- Enumerated
- Aug 13, 2009
- Record last updated
- Jun 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20121107000678); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 597 in Maine → Look up another NPI →
Also registered at 50 Union St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Charles Alexander, MDInternal Medicine Physician1841230588
- Jason Berube, PHARMDPharmacist1891128021
- Alexandria Boley, DOPediatrics Physician1811359896
- Wesam Bolkhir, M.D.Hospitalist Physician1407060189
- Amy Case, PAPhysician Assistant1396998266
- Jesse Cloutier, PAPhysician Assistant1023466562
Verify Mercedes Lim Ang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaine Board of Licensure in Medicine
Search for license MD19406Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average internal medicine physician in 2024
186 Medicare Part D claims for 69 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Prednisone14 claims
- Amlodipine Besylate12 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
- Hospital Medicine Services OF Maine LLCEllsworth, ME
- Maine Medical Services LLCEllsworth, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mercedes Lim Ang among 597 internal medicine physician records in Maine
Mercedes Lim Ang, 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 2009, is newer than 65% of them.
- NPI issued2009 · 65% of these records are older, 33% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2001 · median 2005 among the 369 with a school on file
- Record last updated2021 · 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).
10 internal medicine physician records list a practice address in Ellsworth
They are 10 of the 453 NPPES records with a practice address in Ellsworth, and 597 internal medicine physician records in Maine.
All 597 in Maine → Every provider in Ellsworth → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Charles Alexander, MDEllsworth, ME 046051841230588
- Anita Kolisch, MDEllsworth, ME 046051447283981
- Elizabeth Laverack, M. D.Ellsworth, ME 046051053391300
- Laura Marlowe-Flanagan, D.O.Ellsworth, ME 046051790037620
- Stephen Nightingale, M.D.Ellsworth, ME 046051538140520
- Peter Ossanna, MDEllsworth, ME 046051942249842
- Kathryn Rensenbrink, MDEllsworth, ME 046051124067194
- Petr Smejkal, MDEllsworth, ME 046051922028976
Common questions
What is Mercedes Lim Ang, M.D.'s NPI number?
Mercedes Lim Ang, M.D.'s National Provider Identifier (NPI) is 1033341813, issued on Aug 13, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Mercedes Lim Ang, M.D. located?
The NPPES record lists a practice address at 50 Union St, Ellsworth, ME, 04605. Phone: (207) 664-5311. Providers update this record themselves, so call before visiting.
How can I verify Mercedes Lim Ang, M.D.'s license?
NPPES lists Maine license number MD19406, 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 Mercedes Lim Ang, M.D. prescribe under Medicare Part D?
In 2024, Mercedes Lim Ang, M.D. had 186 Medicare Part D claims for 69 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.