MARISHA L. COOK M. D
NPI 1356487904
Allergy & Immunology - Allergy in Rockford, IL
About Marisha L. Cook M. D NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARISHA L. COOK M. D (NPI 1356487904) is an individual allergy provider in Rockford, Illinois, licensed in Illinois (036128205) and active in the NPI registry since January 2007. She is enrolled in Medicare PECOS, is affiliated with Saint Anthony Medical Center, and is a graduate of Other (2006).
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
Marisha L. Cook 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
2Medicare enrollment records show Marisha Cook reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Rockford, IL 61103
- Reassigned Medicare billing, Illinois enrollment
- 1,375 clinicians in this Medicare group
Janesville, WI 53548
- Reassigned Medicare billing, Wisconsin enrollment
- 1,155 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 7
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Saint Anthony Medical Center
Acute Care Hospitals · Rockford, ILJavon Bea Hospital
Acute Care Hospitals · Rockford, ILOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ROCKFORD, IL 61103
ROCKFORD, IL 61103
ROCKFORD, IL 61103
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 Marisha Cook's NPI number?
The NPI number for Marisha Cook is 1356487904. It was assigned to this individual provider in the NPPES registry on January 30, 2007.
Where is Marisha Cook located?
Marisha Cook practices at 2350 N Rockton Ave, Rockford, IL 61103. The listed phone number is (815) 971-2000.
What is Marisha Cook's specialty?
The primary specialty registered for this NPI is Allergy & Immunology, specializing in Allergy, with taxonomy code 207KA0200X.
Is Marisha Cook enrolled in Medicare?
Yes. Marisha Cook 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 Marisha Cook's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marisha Cook reassigns Medicare benefits to 2 organizations: Rockford Health Physicians (Rockford, IL) and Mercy Health System Corporation (Janesville, WI). 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 Marisha Cook's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Marisha Cook accept?
Health plans from Anthem Blue Cross and Blue Shield, MercyCare and MercyCare Health Plans list Marisha Cook 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 Marisha Cook affiliated with any hospitals?
According to CMS data, Marisha Cook is affiliated with Saint Anthony Medical Center and Javon Bea Hospital.
When was this NPI record last updated?
The NPPES record for Marisha Cook was last updated on February 23, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.
# Marisha L. Cook, M. D · NPI 1356487904
Allergy physician in Rockford, Illinois. Individual provider, active in the CMS NPPES registry since January 30, 2007.
## Identity
- **NPI:** 1356487904 (Entity type: Individual)
- **Enumerated:** January 30, 2007
- **Primary specialty:** Allergy & Immunology - Allergy · taxonomy 207KA0200X
- **State license:** 036128205 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 2350 N ROCKTON AVE, Rockford, IL 61103-3600
- **Phone:** (815) 971-2000 · **Fax:** (815) 971-2585
## 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): Rockford Health Physicians (NPI 1023275278, Rockford, IL); Mercy Health System Corporation (NPI 1598718603, Janesville, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2006
## Record status
- **NPPES last updated:** February 23, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1356487904) · Data from the CMS NPPES public registry.