SEIJA MANISKAS MD, MS
NPI 1861015729
Colon & Rectal Surgery in Upland, CA
About Seija Maniskas Md, Ms NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SEIJA MANISKAS MD, MS (NPI 1861015729) is an individual colon & rectal surgery provider in Upland, California, licensed in California (A187429) and active in the NPI registry since May 2020. She is enrolled in Medicare PECOS, maintains a secondary practice location in Corona, and is a graduate of Other (2020).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Seija Maniskas Md, Ms is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Seija Maniskas reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Duarte, CA 91010
- Reassigned Medicare billing, California enrollment
- 1,335 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 91786 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 14
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
UPLAND, CA 91786
UPLAND, CA 91786
UPLAND, CA 91786
UPLAND, CA 91786
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 Seija Maniskas's NPI number?
The NPI number for Seija Maniskas is 1861015729. It was assigned to this individual provider in the NPPES registry on May 26, 2020.
Where is Seija Maniskas located?
Seija Maniskas practices at 1100 San Bernardino Rd Ste 1100, Upland, CA 91786. The listed phone number is (909) 949-2242.
What is Seija Maniskas's specialty?
The primary specialty registered for this NPI is Colon & Rectal Surgery with taxonomy code 208C00000X.
Is Seija Maniskas enrolled in Medicare?
Yes. Seija Maniskas is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Seija Maniskas's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Seija Maniskas reassigns Medicare benefits to City Of Hope Medical Foundation (Duarte, CA). The 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 Seija Maniskas'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 Seija Maniskas was last updated on August 5, 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.
# Seija Maniskas, MD, MS · NPI 1861015729
Colon & Rectal Surgery physician in Upland, California. Individual provider, active in the CMS NPPES registry since May 26, 2020.
## Identity
- **NPI:** 1861015729 (Entity type: Individual)
- **Enumerated:** May 26, 2020
- **Primary specialty:** Colon & Rectal Surgery · taxonomy 208C00000X
- **State license:** A187429 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1100 SAN BERNARDINO RD STE 1100, Upland, CA 91786-4952
- **Phone:** (909) 949-2242
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** City Of Hope Medical Foundation (NPI 1871886366, Duarte, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** August 5, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1861015729) · Data from the CMS NPPES public registry.