DR. ONA M KAREIVA M.D.
NPI 1225010267
Anesthesiology in Easton, MD
About Dr. Ona M Kareiva M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ONA M KAREIVA M.D. (NPI 1225010267) is an individual anesthesiology provider in Easton, Maryland, licensed in Maryland (D0058323) and active in the NPI registry since November 2005. She is enrolled in Medicare PECOS and is a graduate of Other (1996).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 4
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. Ona M Kareiva 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 Ona Kareiva reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Easton, MD 21601
- Reassigned Medicare billing, Maryland enrollment
- 48 clinicians in this Medicare group
Tucson, AZ 85712
- Reassigned Medicare billing, Arizona enrollment
- 264 clinicians in this Medicare group
Tempe, AZ 85282
- Reassigned Medicare billing, Arizona enrollment
- 65 clinicians in this Medicare group
Tempe, AZ 85282
- Reassigned Medicare billing, Arizona enrollment
- 6 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.
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.
EASTON, MD 21601
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 Ona Kareiva's NPI number?
The NPI number for Ona Kareiva is 1225010267. It was assigned to this individual provider in the NPPES registry on November 16, 2005.
Where is Ona Kareiva located?
Ona Kareiva practices at 219 S Washington St, Easton, MD 21601. The listed phone number is (410) 822-1000.
What is Ona Kareiva's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Ona Kareiva enrolled in Medicare?
Yes. Ona Kareiva 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 Ona Kareiva's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ona Kareiva reassigns Medicare benefits to 4 organizations: Tidewater Anesthesia Associates, PA (Easton, MD), Ias Arizona PLLC (Tucson, AZ), Camelback Anesthesia PLLC (Tempe, AZ) and Foothills Anesthesiology PC (Tempe, AZ). 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 Ona Kareiva's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Ona Kareiva was last updated on February 4, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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. Ona M Kareiva, M.D. · NPI 1225010267
Anesthesiology physician in Easton, Maryland. Individual provider, active in the CMS NPPES registry since November 16, 2005.
## Identity
- **NPI:** 1225010267 (Entity type: Individual)
- **Enumerated:** November 16, 2005
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** D0058323 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 219 S WASHINGTON ST, Easton, MD 21601-2913
- **Phone:** (410) 822-1000 · **Fax:** (410) 819-0712
## 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): Tidewater Anesthesia Associates, PA (NPI 1780621474, Easton, MD); Ias Arizona PLLC (NPI 1689359747, Tucson, AZ); Camelback Anesthesia PLLC (NPI 1831560176, Tempe, AZ); Foothills Anesthesiology PC (NPI 1063508315, Tempe, AZ) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1996
## Record status
- **NPPES last updated:** February 4, 2013
- **Other identifiers:** Medicare PIN S125C906 (MD); Medicaid 699479200 (MD); Other 050084929 (MD); and 1 more
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Source: [NPI Profile](https://npiprofile.com/npi/1225010267) · Data from the CMS NPPES public registry.