CATHERINE O'BRIEN CRNA
NPI 1235521758
Nurse Anesthetist, Certified Registered in Springfield, MA
About Catherine O'brien Crna NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CATHERINE O'BRIEN CRNA (NPI 1235521758) is an individual nurse anesthetist, certified registered in Springfield, Massachusetts, licensed in Massachusetts (217699) and active in the NPI registry since February 2015. She is enrolled in Medicare PECOS, is affiliated with Holyoke Medical Center, and is a graduate of University Of Massachusetts Medical School (1999).
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
Catherine O'brien Crna 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 Catherine O'brien reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Springfield, MA 01118
- Reassigned Medicare billing, Massachusetts enrollment
- 144 clinicians in this Medicare group
Springfield, MA 01107
- Reassigned Medicare billing, Massachusetts enrollment
- 30 clinicians in this Medicare group
Holyoke, MA 01040
- Reassigned Medicare billing, Massachusetts enrollment
- 51 clinicians in this Medicare group
Oxford, MA 01540
- Reassigned Medicare billing, Massachusetts enrollment
- 2,902 clinicians in this Medicare group
Worcester, MA 01605
- Reassigned Medicare billing, Massachusetts enrollment
- 57 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 2
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 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Holyoke Medical Center
Acute Care Hospitals · Holyoke, MABaystate Medical Center
Acute Care Hospitals · Springfield, MAUmass Memorial Medical Center/University Campus
Acute Care Hospitals · Worcester, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 01118 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.
SPRINGFIELD, MA 01118
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 Catherine O'brien's NPI number?
The NPI number for Catherine O'brien is 1235521758. It was assigned to this individual provider in the NPPES registry on February 20, 2015.
Where is Catherine O'brien located?
Catherine O'brien practices at 908 Allen St, Springfield, MA 01118. The listed phone number is (781) 407-7713.
What is Catherine O'brien's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is Catherine O'brien enrolled in Medicare?
Yes. Catherine O'brien 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 Catherine O'brien's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Catherine O'brien reassigns Medicare benefits to 5 organizations: Springfield Anesthesia Service, Inc. (Springfield, MA), Pulse Anesthesia Consultants PC (Springfield, MA), Holyoke Medical Center, Inc. (Holyoke, MA), Umass Memorial Medical Group, Inc. (Oxford, MA) and Tri Anesthesia LLC (Worcester, 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 Catherine O'brien's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Catherine O'brien accept?
Health plans from Taro Health list Catherine O'brien 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 Catherine O'brien affiliated with any hospitals?
According to CMS data, Catherine O'brien is affiliated with Holyoke Medical Center, Baystate Medical Center and Umass Memorial Medical Center/University Campus.
When was this NPI record last updated?
The NPPES record for Catherine O'brien was last updated on September 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 44 days 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.
# Catherine O'brien, CRNA · NPI 1235521758
Nurse Anesthetist, Certified Registered physician in Springfield, Massachusetts. Individual provider, active in the CMS NPPES registry since February 20, 2015.
## Identity
- **NPI:** 1235521758 (Entity type: Individual)
- **Enumerated:** February 20, 2015
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** 217699 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 908 ALLEN ST, Springfield, MA 01118-2533
- **Phone:** (781) 407-7713 · **Fax:** (781) 407-0998
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): Springfield Anesthesia Service, Inc. (NPI 1093768830, Springfield, MA); Pulse Anesthesia Consultants PC (NPI 1407560618, Springfield, MA); Holyoke Medical Center, Inc. (NPI 1750395737, Holyoke, MA); Umass Memorial Medical Group, Inc. (NPI 1982381018, Oxford, MA); Tri Anesthesia LLC (NPI 1275331761, Worcester, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Massachusetts Medical School, class of 1999
## Record status
- **NPPES last updated:** September 14, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1235521758) · Data from the CMS NPPES public registry.