Mary Louisa Barnhart, MD
Addiction Psychiatry Physician · Waterville, ME
Mary Louisa Barnhart, MD is an addiction psychiatry physician with a practice address in Waterville, Maine, and NPI 1811055353, issued on Dec 5, 2006. Check the license (Maine 01440, as entered in NPPES) on the Maine Board of Licensure in Medicine; the Medicare figures below come from public CMS files.
- Name
- Mary Louisa Barnhart
- Credential
- MD
- Primary taxonomy
- Addiction Psychiatry Physician 2084P0802X
- License number
- 01440 ME
Self-reported in NPPES; status is on the state search - Practice location
- 10 Water St, Waterville, ME 04901
- Phone
- (207) 861-3488
- Enumerated
- Dec 5, 2006
- Record last updated
- Jan 12, 2023
- Fax
- (207) 861-3470
- Medicaid ID
- 311000099 ME
- Medicare enrollment
- Enrolled (PECOS I20040505000565); accepts Medicare assignment
- Medical or professional school
- University Of Pittsburgh School Of Medicine, 1979
- Entity
- Type 1 · individual
4 nearest addiction psychiatry physician records → All 5 in Maine → Look up another NPI →
Also registered at 10 Water St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Deborah Bachand, LADCAddiction (Substance Use Disorder) Counselor1033295985
- Ami Bass, LCSWClinical Social Worker1952650004
- Russell Brown, LCSWClinical Social Worker1245316322
- Carol Carothers, LCPC, LADCCounselor1528304250
- Sean Douglas, LCSWClinical Social Worker1881770964
- Lisa Hickey, LCSWClinical Social Worker1174700280
Verify Mary Louisa Barnhart in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaine Board of Licensure in Medicine
Search for license 01440Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
73% fewer Medicare Part D claims than the average addiction psychiatry physician in 2024
195 Medicare Part D claims for 38 beneficiaries, against an average of 716 among the 421 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims.
Most prescribed
- Buprenorphine-Naloxone160 claims
- Suboxone31 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 79.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Recover Together IncPortland, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Addiction Psychiatry Physician providers in Maine
There are 5 addiction psychiatry physician records in Maine.
All 5 in Maine → Every provider in Waterville → Addiction Psychiatry Physician nationwide →
The 4 addiction psychiatry physician records with the nearest ZIP codes
- Nathaniel Bridgeo, LADC, MHRT/C, BHPBangor, ME 044011356224547
- Christopher Buttarazzi, MDPortland, ME 041011124448196
- Jonathan Fellers, MDPortland, ME 041011508091281
- Ryan Jones, CADCBrunswick, ME 040111417753609
Common questions
What is Mary Louisa Barnhart, MD's NPI number?
Mary Louisa Barnhart, MD's National Provider Identifier (NPI) is 1811055353, issued on Dec 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary Louisa Barnhart, MD located?
The NPPES record lists a practice address at 10 Water St, Waterville, ME, 04901. Phone: (207) 861-3488. Providers update this record themselves, so call before visiting.
How can I verify Mary Louisa Barnhart, MD's license?
NPPES lists Maine license number 01440, 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 Mary Louisa Barnhart, MD prescribe under Medicare Part D?
In 2024, Mary Louisa Barnhart, MD had 195 Medicare Part D claims for 38 beneficiaries; the average among addiction psychiatry physician prescribers was 716. Part D covers Medicare prescriptions only.
What is Mary Louisa Barnhart, MD's MIPS final score?
The 2023 MIPS final score is 79.3 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.