DR. MARISSA A LAZOR MD
NPI 1790760759
Anesthesiology in Westwood, MA
About Dr. Marissa A Lazor Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARISSA A LAZOR MD (NPI 1790760759) is an individual anesthesiology provider in Westwood, Massachusetts, licensed in Massachusetts (77421) and active in the NPI registry since December 2005. She is enrolled in Medicare PECOS, is affiliated with New England Baptist Hospital, and is a graduate of Northwestern University Feinberg Medical School (1988).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 4
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. Marissa A Lazor 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
3Medicare enrollment records show Marissa Lazor reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Dedham, MA 02026
- Reassigned Medicare billing, Massachusetts enrollment
- 41 clinicians in this Medicare group
Milton, MA 02186
- Reassigned Medicare billing, Massachusetts enrollment
- Also billed through NPI 1861216038 (Massachusetts)
- 556 clinicians in this Medicare group
Boston, MA 02215
- Reassigned Medicare billing, Massachusetts enrollment
- 2,579 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.
Areas of Expertise CMS Part B claims 6
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
New England Baptist Hospital
Acute Care Hospitals · 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.
WESTWOOD, MA 02090
WESTWOOD, MA 02090
WESTWOOD, MA 02090
WESTWOOD, MA 02090
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 Marissa Lazor's NPI number?
The NPI number for Marissa Lazor is 1790760759. It was assigned to this individual provider in the NPPES registry on December 13, 2005.
Where is Marissa Lazor located?
Marissa Lazor practices at 690 Canton St Suite 325, Westwood, MA 02090. The listed phone number is (781) 407-7713.
What is Marissa Lazor's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Marissa Lazor enrolled in Medicare?
Yes. Marissa Lazor 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 Marissa Lazor's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marissa Lazor reassigns Medicare benefits to 3 organizations: Excel Anesthesia Associates PLLC (Dedham, MA), Associated Physicians Of Harvard Medical Faculty Physicians At Beth Is (Milton, MA) and Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr 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 Marissa Lazor's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Marissa Lazor accept?
Health plans from Taro Health and WellSense Health Plan list Marissa Lazor 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 Marissa Lazor affiliated with any hospitals?
According to CMS data, Marissa Lazor is affiliated with New England Baptist Hospital.
When was this NPI record last updated?
The NPPES record for Marissa Lazor was last updated on January 2, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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. Marissa A Lazor, MD · NPI 1790760759
Anesthesiology physician in Westwood, Massachusetts. Individual provider, active in the CMS NPPES registry since December 13, 2005.
## Identity
- **NPI:** 1790760759 (Entity type: Individual)
- **Enumerated:** December 13, 2005
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 77421 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 690 CANTON ST, SUITE 325, Westwood, MA 02090-2321
- **Phone:** (781) 407-7713 · **Fax:** (781) 407-0998
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Excel Anesthesia Associates PLLC (NPI 1639878713, Dedham, MA); Associated Physicians Of Harvard Medical Faculty Physicians At Beth Is (NPI 1245773308, Milton, MA); Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc (NPI 1194765438, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Northwestern University Feinberg Medical School, class of 1988
## Record status
- **NPPES last updated:** January 2, 2008
- **Other identifiers:** Medicare PIN J30517 (MA); Medicaid 3126641 (MA); Medicare UPIN F80437; and 1 more
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Source: [NPI Profile](https://npiprofile.com/npi/1790760759) · Data from the CMS NPPES public registry.