KAROLINA GREKOV MD
NPI 1841786274
Pediatrics - Pediatric Critical Care Medicine in Palo Alto, CA
About Karolina Grekov Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KAROLINA GREKOV MD (NPI 1841786274) is an individual pediatric critical care medicine provider in Palo Alto, California, licensed in California (A160100) and active in the NPI registry since July 2018. She is enrolled in Medicare PECOS, maintains a secondary practice location in Stanford, and is a graduate of Loma Linda University School Of Medicine (2017).
NPPES Registry Identity
Specialties & Licenses 3
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 and accepts Medicare assignment
Karolina Grekov 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
3Medicare enrollment records show Karolina Grekov reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Palo Alto, CA 94304
- Reassigned Medicare billing, California enrollment
- 3,617 clinicians in this Medicare group
Stanford, CA 94305
- Reassigned Medicare billing, California enrollment
- 4,258 clinicians in this Medicare group
Los Angeles, CA 90027
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Childrens Hospital Los Angeles Medical Group Inc
- 1,281 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.
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 Karolina Grekov's NPI number?
The NPI number for Karolina Grekov is 1841786274. It was assigned to this individual provider in the NPPES registry on July 9, 2018.
Where is Karolina Grekov located?
Karolina Grekov practices at 725 Welch Rd, Palo Alto, CA 94304. The listed phone number is (650) 497-8000.
What is Karolina Grekov's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Critical Care Medicine, with taxonomy code 2080P0203X.
Is Karolina Grekov enrolled in Medicare?
Yes. Karolina Grekov 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 Karolina Grekov's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karolina Grekov reassigns Medicare benefits to 3 organizations: Lpch Medical Group Div Of Lucile (Palo Alto, CA), Stanford Health Care (Stanford, CA) and Children's Hospital Los Angeles Medical Group, Inc. (Los Angeles, CA). 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 Karolina Grekov'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 Karolina Grekov was last updated on August 7, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Karolina Grekov, MD · NPI 1841786274
Pediatric Critical Care Medicine physician in Palo Alto, California. Individual provider, active in the CMS NPPES registry since July 9, 2018.
## Identity
- **NPI:** 1841786274 (Entity type: Individual)
- **Enumerated:** July 9, 2018
- **Primary specialty:** Pediatrics - Pediatric Critical Care Medicine · taxonomy 2080P0203X
- **State license:** A160100 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 725 WELCH RD, Palo Alto, CA 94304-1601
- **Phone:** (650) 497-8000
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Lpch Medical Group Div Of Lucile (NPI 1417907940, Palo Alto, CA); Stanford Health Care (NPI 1437292927, Stanford, CA); Children's Hospital Los Angeles Medical Group, Inc. (NPI 1265530653, Los Angeles, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Loma Linda University School Of Medicine, class of 2017
## Record status
- **NPPES last updated:** August 7, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1841786274) · Data from the CMS NPPES public registry.