KENNETH M GRUNDFAST M.D.
NPI 1336101054
Otolaryngology in Boston, MA
About Kenneth M Grundfast M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KENNETH M GRUNDFAST M.D. (NPI 1336101054) is an individual otolaryngology provider in Boston, Massachusetts, licensed in Massachusetts (160725) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, is affiliated with Boston Medical Center, and maintains 3 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 3
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
Kenneth M Grundfast M.d. 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
4Medicare enrollment records show Kenneth Grundfast reassigns Medicare billing to 4 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
- 27 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 478 clinicians in this Medicare group
Newton, MA 02462
- Reassigned Medicare billing, Massachusetts enrollment
- 16 clinicians in this Medicare group
Washington, DC 20037
- Reassigned Medicare billing, District of Columbia enrollment
- 1,275 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 4
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Boston Medical Center
Acute Care Hospitals · Boston, MAMassachusetts Eye And Ear Infirmary -
Acute Care Hospitals · Boston, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02118 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
BOSTON, MA 02118
BOSTON, MA 02118
BOSTON, MA 02118
BOSTON, MA 02118
BOSTON, MA 02118
BOSTON, MA 02118
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 Kenneth Grundfast's NPI number?
The NPI number for Kenneth Grundfast is 1336101054. It was assigned to this individual provider in the NPPES registry on April 6, 2006.
Where is Kenneth Grundfast located?
Kenneth Grundfast practices at 830 Harrison Ave Ste 1400, Boston, MA 02118. The listed phone number is (617) 638-8124.
What is Kenneth Grundfast's specialty?
The primary specialty registered for this NPI is Otolaryngology with taxonomy code 207Y00000X.
Is Kenneth Grundfast enrolled in Medicare?
Yes. Kenneth Grundfast 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 Kenneth Grundfast's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Kenneth Grundfast reassigns Medicare benefits to 4 organizations: Bumc Otolaryngologic Foundation, Inc. (Boston, MA), Massachusetts Eye And Ear Associates, Inc. (Boston, MA), New England Ear Nose And Throat LLC (Newton, MA) and Medical Faculty Associates, Inc (Washington, DC). 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 Kenneth Grundfast's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Kenneth Grundfast accept?
Health plans from Taro Health and WellSense Health Plan list Kenneth Grundfast 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 Kenneth Grundfast affiliated with any hospitals?
According to CMS data, Kenneth Grundfast is affiliated with Boston Medical Center and Massachusetts Eye And Ear Infirmary -.
When was this NPI record last updated?
The NPPES record for Kenneth Grundfast was last updated on August 25, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months 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.
# Kenneth M Grundfast, M.D. · NPI 1336101054
Otolaryngology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since April 6, 2006.
## Identity
- **NPI:** 1336101054 (Entity type: Individual)
- **Enumerated:** April 6, 2006
- **Primary specialty:** Otolaryngology · taxonomy 207Y00000X
- **State license:** 160725 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 830 HARRISON AVE, STE 1400, Boston, MA 02118
- **Phone:** (617) 638-8124 · **Fax:** (617) 414-4953
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Bumc Otolaryngologic Foundation, Inc. (NPI 1942257159, Boston, MA); Massachusetts Eye And Ear Associates, Inc. (NPI 1932574332, Boston, MA); New England Ear Nose And Throat LLC (NPI 1013279108, Newton, MA); Medical Faculty Associates, Inc (NPI 1417990581, Washington, DC) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** State University Of Ny Upstate Medical University, class of 1969
## Record status
- **NPPES last updated:** August 25, 2026
- **Other identifiers:** Medicaid 110061841A (MA); Medicaid 3115087 (NH)
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Source: [NPI Profile](https://npiprofile.com/npi/1336101054) · Data from the CMS NPPES public registry.