DR. SUSAN ALLISON IRONSTONE MD
NPI 1184854838
Anesthesiology in Worcester, MA
About Dr. Susan Allison Ironstone Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. SUSAN ALLISON IRONSTONE MD (NPI 1184854838) is an individual anesthesiology provider in Worcester, Massachusetts, licensed in Massachusetts (270260) and active in the NPI registry since July 2009. She is enrolled in Medicare PECOS, is affiliated with Umass Memorial Medical Center/university Campus, and maintains a secondary practice location in Pittsfield.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Other Identifiers 1
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. Susan Allison Ironstone 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 Susan Ironstone reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Worcester, MA 01655
- Reassigned Medicare billing, Massachusetts enrollment
- 2,902 clinicians in this Medicare group
Pittsfield, MA 01201
- Reassigned Medicare billing, Massachusetts enrollment
- 394 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
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.
Umass Memorial Medical Center/University Campus
Acute Care Hospitals · Worcester, 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.
WORCESTER, MA 01655
WORCESTER, MA 01655
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 Susan Ironstone's NPI number?
The NPI number for Susan Ironstone is 1184854838. It was assigned to this individual provider in the NPPES registry on July 15, 2009.
Where is Susan Ironstone located?
Susan Ironstone practices at 55 Lake Ave N, Worcester, MA 01655. The listed phone number is (508) 334-3271.
What is Susan Ironstone's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Susan Ironstone enrolled in Medicare?
Yes. Susan Ironstone 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 Susan Ironstone's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Susan Ironstone reassigns Medicare benefits to 2 organizations: Umass Memorial Medical Group Inc (Worcester, MA) and Berkshire Medical Center, Inc (Pittsfield, 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 Susan Ironstone's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Susan Ironstone accept?
Health plans from Taro Health list Susan Ironstone 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 Susan Ironstone affiliated with any hospitals?
According to CMS data, Susan Ironstone is affiliated with Umass Memorial Medical Center/University Campus.
When was this NPI record last updated?
The NPPES record for Susan Ironstone was last updated on February 1, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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. Susan Allison Ironstone, MD · NPI 1184854838
Anesthesiology physician in Worcester, Massachusetts. Individual provider, active in the CMS NPPES registry since July 15, 2009.
## Identity
- **NPI:** 1184854838 (Entity type: Individual)
- **Enumerated:** July 15, 2009
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 270260 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 55 LAKE AVE N, Worcester, MA 01655-0002
- **Phone:** (508) 334-3271 · **Fax:** (508) 856-5911
## 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): Umass Memorial Medical Group Inc (NPI 1760445373, Worcester, MA); Berkshire Medical Center, Inc (NPI 1295765261, Pittsfield, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2009
## Record status
- **NPPES last updated:** February 1, 2023
- **Other identifiers:** Medicaid 110122583A (MA)
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Source: [NPI Profile](https://npiprofile.com/npi/1184854838) · Data from the CMS NPPES public registry.