Simon Maurice Sebastian Selwyn, CNP
Psychiatric/Mental Health Nurse Practitioner · Waltham, MA
Simon Maurice Sebastian Selwyn, CNP is a psychiatric/mental health nurse practitioner with a practice address in Waltham, Massachusetts, and NPI 1821576935, issued on Jul 31, 2018. Check the license (Massachusetts 2284419, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Simon Maurice Sebastian Selwyn
- Credential
- CNP
- Primary taxonomy
- Psychiatric/Mental Health Nurse Practitioner 363LP0808X
- License numbers
- 2284419 MA
RN2284419 MA
Self-reported in NPPES; status is on the state search - Practice location
- 465 Waverly Oaks RD, Waltham, MA 02452
- Phone
- (617) 596-1975
- Enumerated
- Jul 31, 2018
- Record last updated
- Mar 25, 2024
- Entity
- Type 1 · individual
8 nearest psychiatric/mental health nurse practitioner records → All 2,169 in Massachusetts → Look up another NPI →
Also registered at 465 Waverly Oaks RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Molly Fischman, M.S., CF-SLPSpeech-Language Pathologist1518316132
- Lauren HodgesSpeech-Language Pathologist1487581831
Verify Simon Maurice Sebastian Selwyn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 2284419Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average psychiatric/mental health nurse practitioner in 2024
66 Medicare Part D claims, against an average of 906 among the 30,717 providers of this specialty who prescribed in Part D.
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.
Simon Maurice Sebastian Selwyn among 2,169 psychiatric/mental health nurse practitioner records in Massachusetts
Simon Maurice Sebastian Selwyn, CNP 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 2018, is newer than 35% of them.
- NPI issued2018 · 35% of these records are older, 61% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2024 · 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).
20 psychiatric/mental health nurse practitioner records list a practice address in Waltham
They are 20 of the 2,111 NPPES records with a practice address in Waltham, and 2,169 psychiatric/mental health nurse practitioner records in Massachusetts.
All 2,169 in Massachusetts → Every provider in Waltham → Psychiatric/Mental Health Nurse Practitioner nationwide →
The 8 psychiatric/mental health nurse practitioner records with the nearest ZIP codes
- Samuel DavidsonWaltham, MA 024521831885615
- Eleni Koudanis, APRNWaltham, MA 024521700661253
- Miriam Lopes Nakasi, PMHNPWaltham, MA 024521093492647
- Maria Nanyonjo, PMHNP-BCWaltham, MA 024521497644603
- Alberta Adu, CNPWaltham, MA 024511528722451
- Judith Casarella, APRNWaltham, MA 024511528127750
- Kathleen Davidson, RNCSWaltham, MA 024531366554149
- Rachel Egan, RN, PMHNP-BCWaltham, MA 024531285024448
Common questions
What is Simon Maurice Sebastian Selwyn, CNP's NPI number?
Simon Maurice Sebastian Selwyn, CNP's National Provider Identifier (NPI) is 1821576935, issued on Jul 31, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Simon Maurice Sebastian Selwyn, CNP located?
The NPPES record lists a practice address at 465 Waverly Oaks RD, Waltham, MA, 02452. Phone: (617) 596-1975. Providers update this record themselves, so call before visiting.
How can I verify Simon Maurice Sebastian Selwyn, CNP's license?
NPPES lists Massachusetts license number 2284419, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Simon Maurice Sebastian Selwyn, CNP prescribe under Medicare Part D?
In 2024, Simon Maurice Sebastian Selwyn, CNP had 66 Medicare Part D claims; 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.