Maria S. Koen, NP
Family Nurse Practitioner · Boston, MA
Maria S. Koen, NP is a family nurse practitioner with a practice address in Boston, Massachusetts, and NPI 1891833935, issued on Feb 1, 2007. Check the license (Massachusetts 239263, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Maria S. Koen
- Credential
- NP
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- 239263 MA
Self-reported in NPPES; status is on the state search - Practice location
- 1 Joslin PL, Boston, MA 02215
- Phone
- (617) 732-2699
- Enumerated
- Feb 1, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20070321000216); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 4,724 in Massachusetts → Look up another NPI →
Also registered at 1 Joslin PL
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Maria S. Koen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 239263Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
34% more Medicare Part D claims than the average family nurse practitioner in 2024
1,754 Medicare Part D claims for 234 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D. Brand-name drugs were 63% of claims.
Most prescribed
- Jardiance135 claims
- Ozempic122 claims
- Mounjaro110 claims
- Metformin Hcl106 claims
- Trulicity90 claims
- Lantus Solostar81 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: $141.10
1 payment: food and beverage; the largest payer was Sanofi-Aventis U.S. LLC. The 99,489 providers of this specialty with any payment received $650.95 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.
Bills Medicare through 2 group practices
- Harvard Medical Faculty Phys AT Beth Israel Deaconess Med Ctr IncBoston, MA
- Joslin Clinic IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Maria S. Koen among 4,724 family nurse practitioner records in Massachusetts
Maria S. Koen, NP is one of 4,724 family nurse practitioner records with a practice address in Massachusetts. 71% 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 9% of them.
- NPI issued2007 · 9% of these records are older, 86% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2006 · median 2019 among the 2,704 with a school on file
- Record last updated2007 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
938 family nurse practitioner records list a practice address in Boston
They are 938 of the 41,865 NPPES records with a practice address in Boston, and 4,724 family nurse practitioner records in Massachusetts.
All 4,724 in Massachusetts → Every provider in Boston → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Jennifer Brown, CNPBoston, MA 022151861460776
- Nicole Catatao, NPBoston, MA 022151588830160
- Nicole Desrosiers, N.P.Boston, MA 022151811167992
- Suzanne Dipalma, NPBoston, MA 022151669692455
- Thomas Doyle, FNPBoston, MA 022151912137191
- Cailin Duram, FNPBoston, MA 022151700110012
- Maressa FreitasBoston, MA 022151033342811
- Margaret Killebrew, NPBoston, MA 022151568509404
Common questions
What is Maria S. Koen, NP's NPI number?
Maria S. Koen, NP's National Provider Identifier (NPI) is 1891833935, issued on Feb 1, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Maria S. Koen, NP located?
The NPPES record lists a practice address at 1 Joslin PL, Boston, MA, 02215. Phone: (617) 732-2699. Providers update this record themselves, so call before visiting.
How can I verify Maria S. Koen, NP's license?
NPPES lists Massachusetts license number 239263, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Maria S. Koen, NP prescribe under Medicare Part D?
In 2024, Maria S. Koen, NP had 1,754 Medicare Part D claims for 234 beneficiaries; the average among family nurse practitioner prescribers was 1,305. 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.