DR. KATELYN SULLIVAN D.O.
NPI 1205220720
Emergency Medicine in Springfield, MA
About Dr. Katelyn Sullivan D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KATELYN SULLIVAN D.O. (NPI 1205220720) is an individual emergency medicine provider in Springfield, Massachusetts, licensed in Massachusetts (274956) and active in the NPI registry since March 2015. She is enrolled in Medicare PECOS, is affiliated with South Shore Hospital, and is a graduate of Other (2015).
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. Katelyn Sullivan D.o. 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
5Medicare enrollment records show Katelyn Sullivan reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Ayer, MA 01432
- Reassigned Medicare billing, Massachusetts enrollment
- 290 clinicians in this Medicare group
Boston, MA 02111
- Reassigned Medicare billing, Massachusetts enrollment
- 30 clinicians in this Medicare group
Quincy, MA 02169
- Reassigned Medicare billing, Massachusetts enrollment
- 62 clinicians in this Medicare group
Brockton, MA 02302
- Reassigned Medicare billing, Massachusetts enrollment
- 81 clinicians in this Medicare group
Weymouth, MA 02190
- Reassigned Medicare billing, Massachusetts enrollment
- 671 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 11
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.
South Shore Hospital
Acute Care Hospitals · South Weymouth, MATufts Medical Center
Acute Care Hospitals · Boston, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 01199 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
SPRINGFIELD, MA 01199
SPRINGFIELD, MA 01199
SPRINGFIELD, MA 01199
SPRINGFIELD, MA 01199
SPRINGFIELD, MA 01199
SPRINGFIELD, MA 01199
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 Katelyn Sullivan's NPI number?
The NPI number for Katelyn Sullivan is 1205220720. It was assigned to this individual provider in the NPPES registry on March 23, 2015.
Where is Katelyn Sullivan located?
Katelyn Sullivan practices at Baystate Medical Ctr 759 Chestnut Steet, Springfield, MA 01199. The listed phone number is (413) 794-0000.
What is Katelyn Sullivan's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Katelyn Sullivan enrolled in Medicare?
Yes. Katelyn Sullivan 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 Katelyn Sullivan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Katelyn Sullivan reassigns Medicare benefits to 5 organizations: Steward Emergency Physicians, Inc (Ayer, MA), Tufts Medical Center Ep LLC (Boston, MA), South Shore Health Express, Inc (Quincy, MA), Brockton Hospital, Inc. (Brockton, MA) and Coastal Medical Associates (Weymouth, 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 Katelyn Sullivan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Katelyn Sullivan accept?
Health plans from Taro Health list Katelyn Sullivan 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 Katelyn Sullivan affiliated with any hospitals?
According to CMS data, Katelyn Sullivan is affiliated with South Shore Hospital and Tufts Medical Center.
When was this NPI record last updated?
The NPPES record for Katelyn Sullivan was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Dr. Katelyn Sullivan, D.O. · NPI 1205220720
Emergency Medicine physician in Springfield, Massachusetts. Individual provider, active in the CMS NPPES registry since March 23, 2015.
## Identity
- **NPI:** 1205220720 (Entity type: Individual)
- **Enumerated:** March 23, 2015
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 274956 (Massachusetts)
- **Sole proprietor:** Yes
## Practice location
- **Address:** BAYSTATE MEDICAL CTR, 759 CHESTNUT STEET, Springfield, MA 01199-0001
- **Phone:** (413) 794-0000
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Steward Emergency Physicians, Inc (NPI 1780971275, Ayer, MA); Tufts Medical Center Ep LLC (NPI 1609015262, Boston, MA); South Shore Health Express, Inc (NPI 1144713199, Quincy, MA); Brockton Hospital, Inc. (NPI 1063431286, Brockton, MA); Coastal Medical Associates (NPI 1932175684, Weymouth, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** September 11, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1205220720) · Data from the CMS NPPES public registry.