Mary Elizabeth Diamond, D.O.
Child & Adolescent Psychiatry Physician · Paoli, PA
Mary Elizabeth Diamond, D.O. is a child & adolescent psychiatry physician with a practice address in Paoli, Pennsylvania, and NPI 1962617837, issued on May 13, 2007. Check the license (Pennsylvania OS008869L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Mary Elizabeth Diamond
- Credential
- D.O.
- Primary taxonomy
- Child & Adolescent Psychiatry Physician 2084P0804X
- License number
- OS008869L PA
Self-reported in NPPES; status is on the state search - Practice location
- 41 Paoli Plz, Paoli, PA 19301
- Phone
- (610) 296-9238
- Enumerated
- May 13, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (610) 296-9239
- Medicare enrollment
- Enrolled (PECOS I20180521001313); accepts Medicare assignment
- Medical or professional school
- Philadelphia College Of Osteopathic Medicine, 1994
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest child & adolescent psychiatry physician records → All 398 in Pennsylvania → Look up another NPI →
Verify Mary Elizabeth Diamond in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license OS008869LCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
21% fewer Medicare Part D claims than the average child & adolescent psychiatry physician in 2024
398 Medicare Part D claims for 27 beneficiaries, against an average of 504 among the 3,545 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Bupropion Xl48 claims
- Dextroamphetamine-Amphetamine41 claims
- Lamotrigine36 claims
- Duloxetine Hcl29 claims
- Clonazepam26 claims
- Aripiprazole19 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
- Med Psych Services LLCWilmington, DE
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Elizabeth Diamond among 398 child & adolescent psychiatry physician records in Pennsylvania
Mary Elizabeth Diamond, D.O. is one of 398 child & adolescent psychiatry physician records with a practice address in Pennsylvania. 57% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 30% of them.
- NPI issued2007 · 30% of these records are older, 47% newer
- In a Medicare fileYes · 57% of these records are
- In the CMS Doctors and Clinicians fileYes · 29% of these records are
- Graduated1994 · median 2000 among the 116 with a school on file
- Record last updated2007 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0804X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Child & Adolescent Psychiatry Physician providers in Pennsylvania
There are 398 child & adolescent psychiatry physician records in Pennsylvania.
All 398 in Pennsylvania → Every provider in Paoli → Child & Adolescent Psychiatry Physician nationwide →
The 8 child & adolescent psychiatry physician records with the nearest ZIP codes
- Ingeborg Damstra, M.D.Paoli, PA 193011689883241
- Chris Burritt, D.O.Devon, PA 193331548556210
- Robert Newbrough, MDDowningtown, PA 193351073736708
- Raheela Sultan, M.D.Glen Mills, PA 193421245625318
- Janet Baird, M.D.Glenmoore, PA 193431184778227
- M Hossein Etezady, MDMalvern, PA 193551548249840
- James Feussner, MDMalvern, PA 193551508981572
- Owen Hagino, M.D.Malvern, PA 193551225262793
Common questions
What is Mary Elizabeth Diamond, D.O.'s NPI number?
Mary Elizabeth Diamond, D.O.'s National Provider Identifier (NPI) is 1962617837, issued on May 13, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mary Elizabeth Diamond, D.O. located?
The NPPES record lists a practice address at 41 Paoli Plz, Paoli, PA, 19301. Phone: (610) 296-9238. Providers update this record themselves, so call before visiting.
How can I verify Mary Elizabeth Diamond, D.O.'s license?
NPPES lists Pennsylvania license number OS008869L, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mary Elizabeth Diamond, D.O. prescribe under Medicare Part D?
In 2024, Mary Elizabeth Diamond, D.O. had 398 Medicare Part D claims for 27 beneficiaries; the average among child & adolescent psychiatry physician prescribers was 504. 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.