DR. MARY F LANDRIGAN-OSSAR MD, PHD
NPI 1487616850
Anesthesiology in Boston, MA
About Dr. Mary F Landrigan-ossar Md, Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARY F LANDRIGAN-OSSAR MD, PHD (NPI 1487616850) is an individual anesthesiology provider in Boston, Massachusetts, licensed in Massachusetts (223170) and active in the NPI registry since April 2006. She is enrolled in Medicare PECOS, is affiliated with Boston Children's Hospital, and is a graduate of Icahn School Of Medicine At Mount Sinai (2000).
NPPES Registry Identity
Specialties & Licenses
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
Dr. Mary F Landrigan-ossar Md, Phd 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 Mary Landrigan-ossar reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 256 clinicians in this Medicare group
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 4,574 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Boston Children's Hospital
Childrens · Boston, MAOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOSTON, MA 02115
BOSTON, MA 02115
BOSTON, MA 02115
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 Mary Landrigan-ossar's NPI number?
The NPI number for Mary Landrigan-ossar is 1487616850. It was assigned to this individual provider in the NPPES registry on April 3, 2006.
Where is Mary Landrigan-ossar located?
Mary Landrigan-ossar practices at 300 Longwood Ave, Boston, MA 02115. The listed phone number is (617) 355-7737.
What is Mary Landrigan-ossar's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Mary Landrigan-ossar enrolled in Medicare?
Yes. Mary Landrigan-ossar 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 Mary Landrigan-ossar's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Landrigan-ossar reassigns Medicare benefits to 2 organizations: Chmc Anesthesia Foundation Inc (Boston, MA) and Brigham & Womens Physicians Organization 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 Mary Landrigan-ossar's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mary Landrigan-ossar accept?
Health plans from Taro Health list Mary Landrigan-ossar 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.
Is Mary Landrigan-ossar affiliated with any hospitals?
According to CMS data, Mary Landrigan-ossar is affiliated with Boston Children's Hospital.
When was this NPI record last updated?
The NPPES record for Mary Landrigan-ossar was last updated on August 21, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.
# Dr. Mary F Landrigan-Ossar, MD, PHD · NPI 1487616850
Anesthesiology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since April 3, 2006.
## Identity
- **NPI:** 1487616850 (Entity type: Individual)
- **Enumerated:** April 3, 2006
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 223170 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 LONGWOOD AVE, Boston, MA 02115-5724
- **Phone:** (617) 355-7737
## 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): Chmc Anesthesia Foundation Inc (NPI 1831268754, Boston, MA); Brigham & Womens Physicians Organization Inc (NPI 1033535497, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Icahn School Of Medicine At Mount Sinai, class of 2000
## Record status
- **NPPES last updated:** August 21, 2007
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Source: [NPI Profile](https://npiprofile.com/npi/1487616850) · Data from the CMS NPPES public registry.