SHARON E O'BRIEN MD
NPI 1427046598
Pediatrics - Pediatric Cardiology in Boston, MA
About Sharon E O'brien Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SHARON E O'BRIEN MD (NPI 1427046598) is an individual pediatric cardiology provider in Boston, Massachusetts, licensed in Massachusetts (156607) and active in the NPI registry since October 2005. She is enrolled in Medicare PECOS and is a graduate of Loyola University Of Chicago, Stritch School Of Medicine (1992).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Sharon E O'brien Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Sharon O'brien reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02118
- Reassigned Medicare billing, Massachusetts enrollment
- 195 clinicians in this Medicare group
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 220 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Sharon O'brien's NPI number?
The NPI number for Sharon O'brien is 1427046598. It was assigned to this individual provider in the NPPES registry on October 12, 2005.
Where is Sharon O'brien located?
Sharon O'brien practices at 850 Harrison Ave Yacc5, Boston, MA 02118. The listed phone number is (617) 414-4841.
What is Sharon O'brien's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Cardiology, with taxonomy code 2080P0202X.
Is Sharon O'brien enrolled in Medicare?
Yes. Sharon O'brien is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Sharon O'brien's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sharon O'brien reassigns Medicare benefits to 2 organizations: Child Health Foundation Of Boston, Inc. (Boston, MA) and Boston Childrens Heart Foundation Inc (Boston, MA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Sharon O'brien's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Sharon O'brien accept?
Health plans from Taro Health and WellSense Health Plan list Sharon O'brien as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Sharon O'brien was last updated on July 9, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Sharon E O'brien, MD · NPI 1427046598
Pediatric Cardiology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since October 12, 2005.
## Identity
- **NPI:** 1427046598 (Entity type: Individual)
- **Enumerated:** October 12, 2005
- **Primary specialty:** Pediatrics - Pediatric Cardiology · taxonomy 2080P0202X
- **State license:** 156607 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 850 HARRISON AVE, YACC5, Boston, MA 02118-4001
- **Phone:** (617) 414-4841 · **Fax:** (617) 414-4547
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Child Health Foundation Of Boston, Inc. (NPI 1619969920, Boston, MA); Boston Childrens Heart Foundation Inc (NPI 1982680922, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Loyola University Of Chicago, Stritch School Of Medicine, class of 1992
## Record status
- **NPPES last updated:** July 9, 2014
- **Other identifiers:** Medicaid 110059717A (MA); Medicare PIN A23514 (MA)
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Source: [NPI Profile](https://npiprofile.com/npi/1427046598) · Data from the CMS NPPES public registry.