Alexander Thomas O'Brien, PMHNP
Psychiatric/Mental Health Nurse Practitioner · Chestnut Hill, MA
Alexander Thomas O'Brien, PMHNP is a psychiatric/mental health nurse practitioner with a practice address in Chestnut Hill, Massachusetts, and NPI 1598420770, issued on Nov 3, 2021. Check the license (Massachusetts 234518, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Alexander Thomas O'Brien
- Credential
- PMHNP
- Primary taxonomy
- Psychiatric/Mental Health Nurse Practitioner 363LP0808X
- License number
- 234518 MA
Self-reported in NPPES; status is on the state search - Practice location
- 300 South St, Chestnut Hill, MA 02467
- Phone
- (617) 469-0300
- Enumerated
- Nov 3, 2021
- Record last updated
- Mar 13, 2023
- Entity
- Type 1 · individual
8 nearest psychiatric/mental health nurse practitioner records → All 2,169 in Massachusetts → Look up another NPI →
Also registered at 300 South St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Katelyn AjemianStudent in an Organized Health Care Education/Training Program1720673031
- Sarah Andreotta, LICSWClinical Social Worker1639667025
- Beth Berman, LICSWClinical Social Worker1386135598
- Olivia Carrick, M.D.Psychiatry Physician1457513061
- Deborah Flint, FNPFamily Nurse Practitioner1578637922
- Amy Gusefski, LCSWSocial Worker1487339305
Verify Alexander Thomas O'Brien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 234518Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
50% fewer Medicare Part D claims than the average psychiatric/mental health nurse practitioner in 2024
456 Medicare Part D claims for 68 beneficiaries, against an average of 906 among the 30,717 providers of this specialty who prescribed in Part D.
Most prescribed
- Quetiapine Fumarate39 claims
- Benztropine Mesylate32 claims
- Trazodone Hcl29 claims
- Hydroxyzine Pamoate23 claims
- Gabapentin20 claims
- Olanzapine17 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.
Industry payments in 2024: $22.47
1 payment: food and beverage; the largest payer was Indivior Inc. The 23,362 providers of this specialty with any payment received $1,027.77 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Alexander Thomas O'Brien among 2,169 psychiatric/mental health nurse practitioner records in Massachusetts
Alexander Thomas O'Brien, PMHNP is one of 2,169 psychiatric/mental health nurse practitioner records with a practice address in Massachusetts. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 52% of them.
- NPI issued2021 · 52% of these records are older, 41% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2023 · 23% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LP0808X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
8 psychiatric/mental health nurse practitioner records list a practice address in Chestnut Hill
They are 8 of the 772 NPPES records with a practice address in Chestnut Hill, and 2,169 psychiatric/mental health nurse practitioner records in Massachusetts.
All 2,169 in Massachusetts → Every provider in Chestnut Hill → Psychiatric/Mental Health Nurse Practitioner nationwide →
The 8 psychiatric/mental health nurse practitioner records with the nearest ZIP codes
- Domenic Ciampa, MSNChestnut Hill, MA 024671790633527
- Somatra Connolly, MSN, RN, PMHNP-BCChestnut Hill, MA 024671003164310
- Raymond Gasser, DNP, MS, PMHNP-BC,Chestnut Hill, MA 024671376179671
- Taylor Gray, PMHNP-BC, LICSWChestnut Hill, MA 024671770991218
- Christopher Hallett, CNPChestnut Hill, MA 024671679940217
- Ruthann Looper, NURSE PRACTITIONERChestnut Hill, MA 024671891944963
- Alyssa Plaud Mainelli, RNChestnut Hill, MA 024671720977309
- Ashley Starr, CNPAuburndale, MA 024661548079874
Common questions
What is Alexander Thomas O'Brien, PMHNP's NPI number?
Alexander Thomas O'Brien, PMHNP's National Provider Identifier (NPI) is 1598420770, issued on Nov 3, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Alexander Thomas O'Brien, PMHNP located?
The NPPES record lists a practice address at 300 South St, Chestnut Hill, MA, 02467. Phone: (617) 469-0300. Providers update this record themselves, so call before visiting.
How can I verify Alexander Thomas O'Brien, PMHNP's license?
NPPES lists Massachusetts license number 234518, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Alexander Thomas O'Brien, PMHNP prescribe under Medicare Part D?
In 2024, Alexander Thomas O'Brien, PMHNP had 456 Medicare Part D claims for 68 beneficiaries; the average among psychiatric/mental health nurse practitioner prescribers was 906. 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.