Caitlin O'Callaghan Reen, NP
Adult Health Nurse Practitioner · Boston, MA
Caitlin O'Callaghan Reen, NP is an adult health nurse practitioner with a practice address in Boston, Massachusetts, and NPI 1033391685, issued on Dec 5, 2007. Check the license (Massachusetts 256018, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Caitlin O'Callaghan Reen
- Credential
- NP
- Primary taxonomy
- Adult Health Nurse Practitioner 363LA2200X
- License number
- 256018 MA
Self-reported in NPPES; status is on the state search - Practice location
- 55 Fruit St, Boston, MA 02114
- Phone
- (617) 724-0122
- Enumerated
- Dec 5, 2007
- Record last updated
- Feb 18, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080403000282); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest adult health nurse practitioner records → All 1,465 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 Caitlin O'Callaghan Reen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 256018Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average adult health nurse practitioner in 2024
64 Medicare Part D claims for 49 beneficiaries, against an average of 1,280 among the 16,937 providers of this specialty who prescribed in Part D.
Most prescribed
- Prednisone24 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: $24,477.25
74 payments; by number, the most common kind was food and beverage; the largest payer was Edwards Lifesciences Corporation. The 12,291 providers of this specialty with any payment received $946.40 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
- Massachusetts General Physicians Organization IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Caitlin O'Callaghan Reen among 1,465 adult health nurse practitioner records in Massachusetts
Caitlin O'Callaghan Reen, NP is one of 1,465 adult health nurse practitioner records with a practice address in Massachusetts. 61% 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 27% of them.
- NPI issued2007 · 27% of these records are older, 56% newer
- In a Medicare fileYes · 61% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated2007 · median 2010 among the 634 with a school on file
- Record last updated2016 · 73% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LA2200X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
454 adult health nurse practitioner records list a practice address in Boston
They are 454 of the 41,865 NPPES records with a practice address in Boston, and 1,465 adult health nurse practitioner records in Massachusetts.
All 1,465 in Massachusetts → Every provider in Boston → Adult Health Nurse Practitioner nationwide →
The 8 adult health nurse practitioner records with the nearest ZIP codes
- Richard Ahern, ANPBoston, MA 021141508825951
- Martha Brezina, NPBoston, MA 021141629087432
- Deborah Bullard, N.P.Boston, MA 021141700974854
- Amy Casazza, ANP-BCBoston, MA 021141417015835
- Diane Doyle, NPBoston, MA 021141881751600
- Sheila Falco, MS, RN, CSBoston, MA 021141376691063
- Camille Madden, N.P.Boston, MA 021141639226988
- Patricia Olsen, NPBoston, MA 021141790833309
Common questions
What is Caitlin O'Callaghan Reen, NP's NPI number?
Caitlin O'Callaghan Reen, NP's National Provider Identifier (NPI) is 1033391685, issued on Dec 5, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Caitlin O'Callaghan Reen, NP located?
The NPPES record lists a practice address at 55 Fruit St, Boston, MA, 02114. Phone: (617) 724-0122. Providers update this record themselves, so call before visiting.
How can I verify Caitlin O'Callaghan Reen, NP's license?
NPPES lists Massachusetts license number 256018, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Caitlin O'Callaghan Reen, NP prescribe under Medicare Part D?
In 2024, Caitlin O'Callaghan Reen, NP had 64 Medicare Part D claims for 49 beneficiaries; the average among adult health nurse practitioner prescribers was 1,280. 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.