Kate Marie O'Brien, NP
Nurse Practitioner · Boston, MA
Kate Marie O'Brien, NP is a nurse practitioner with a practice address in Boston, Massachusetts, and NPI 1609107887, issued on Jan 27, 2010. Check the license (Massachusetts RN273620, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Kate Marie O'Brien
- Credential
- NP
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License number
- RN273620 MA
Self-reported in NPPES; status is on the state search - Practice location
- 55 Fruit St, Boston, MA 02114
- Phone
- (857) 367-1486
- Enumerated
- Jan 27, 2010
- Record last updated
- Apr 13, 2026
- Medicare enrollment
- Enrolled (PECOS I20150831000493); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 3,480 in Massachusetts → Look up another NPI →
Also registered at 55 Fruit St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Kate Marie 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 RN273620Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average nurse practitioner in 2024
72 Medicare Part D claims for 23 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 42% of 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: $462.59
4 payments; by number, the most common kind was food and beverage; the largest payer was Zoll Services LLC (a/k/a Zoll LifeCor Corp). The 38,884 providers of this specialty with any payment received $791.64 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 one group practice
- Regents OF The Univ OF CASacramento, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kate Marie O'Brien among 3,480 nurse practitioner records in Massachusetts
Kate Marie O'Brien, NP is one of 3,480 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 2010, is newer than 36% of them.
- NPI issued2010 · 36% of these records are older, 62% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 56% of these records are
- Graduated2009 · median 2017 among the 1,963 with a school on file
- Record last updated2026 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
961 nurse practitioner records list a practice address in Boston
They are 961 of the 41,865 NPPES records with a practice address in Boston, and 3,480 nurse practitioner records in Massachusetts.
All 3,480 in Massachusetts → Every provider in Boston → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Diane Bucknill, NPBoston, MA 021141376578658
- Debra Cambridge, NPBoston, MA 021141366430548
- Paula Curren, NPBoston, MA 021141457388373
- Beverly Gerade, NPBoston, MA 021141538119847
- Melissa Goode, N.P.Boston, MA 021141891736369
- Therese Hanley, NPBoston, MA 021141568494607
- Amy Kendall, N.P.Boston, MA 021141710942438
- Tara Killeen, N.P.Boston, MA 021141588688865
Common questions
What is Kate Marie O'Brien, NP's NPI number?
Kate Marie O'Brien, NP's National Provider Identifier (NPI) is 1609107887, issued on Jan 27, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Kate Marie O'Brien, NP located?
The NPPES record lists a practice address at 55 Fruit St, Boston, MA, 02114. Phone: (857) 367-1486. Providers update this record themselves, so call before visiting.
How can I verify Kate Marie O'Brien, NP's license?
NPPES lists Massachusetts license number RN273620, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Kate Marie O'Brien, NP prescribe under Medicare Part D?
In 2024, Kate Marie O'Brien, NP had 72 Medicare Part D claims for 23 beneficiaries; the average among nurse practitioner prescribers was 1,109. 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.