MS. MARY ANN HOLEM FNP-BC
NPI 1972897791
Nurse Practitioner - Family in Crystal Lake, IL
About Ms. Mary Ann Holem Fnp-bc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. MARY ANN HOLEM FNP-BC (NPI 1972897791) is an individual family provider in Crystal Lake, Illinois, licensed in Illinois (209008856) and active in the NPI registry since June 2011. She is enrolled in Medicare PECOS, is affiliated with Advocate Condell Medical Center, and maintains 4 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 4
Other Identifiers 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
Ms. Mary Ann Holem Fnp-bc 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 Mary Holem reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Carol Stream, IL 60122
- Reassigned Medicare billing, Illinois enrollment
- 4,817 clinicians in this Medicare group
Round Lake Beach, IL 60073
- Reassigned Medicare billing, Illinois enrollment
- 38 clinicians in this Medicare group
Park Ridge, IL 60068
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Advocate Health And Hospitals Corporation
- 4,870 clinicians in this Medicare group
Zion, IL 60099
- Reassigned Medicare billing, Illinois enrollment
- 253 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Advocate Condell Medical Center
Acute Care Hospitals · Libertyville, ILPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 60014 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.
CRYSTAL LAKE, IL 60014
CRYSTAL LAKE, IL 60014
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 Mary Holem's NPI number?
The NPI number for Mary Holem is 1972897791. It was assigned to this individual provider in the NPPES registry on June 9, 2011.
Where is Mary Holem located?
Mary Holem practices at 360 Station Dr, Crystal Lake, IL 60014. The listed phone number is (815) 338-6600.
What is Mary Holem's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Mary Holem enrolled in Medicare?
Yes. Mary Holem 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 Mary Holem's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Holem reassigns Medicare benefits to 4 organizations: Northwestern Medical Faculty Foundation (Carol Stream, IL), Lake County Acute Care, LLP (Round Lake Beach, IL), Lutheran General Hospital (Park Ridge, IL) and City Of Hope Medical Group Of Illinois PLLC (Zion, IL). 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 Mary Holem's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Mary Holem affiliated with any hospitals?
According to CMS data, Mary Holem is affiliated with Advocate Condell Medical Center.
When was this NPI record last updated?
The NPPES record for Mary Holem was last updated on October 19, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.
# Ms. Mary Ann Holem, FNP-BC · NPI 1972897791
Family physician in Crystal Lake, Illinois. Individual provider, active in the CMS NPPES registry since June 9, 2011.
## Identity
- **NPI:** 1972897791 (Entity type: Individual)
- **Enumerated:** June 9, 2011
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** 209008856 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 360 STATION DR, Crystal Lake, IL 60014
- **Phone:** (815) 338-6600 · **Fax:** (815) 455-8044
## 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): Northwestern Medical Faculty Foundation (NPI 1346235314, Carol Stream, IL); Lake County Acute Care, LLP (NPI 1356448542, Round Lake Beach, IL); Lutheran General Hospital (NPI 1801809306, Park Ridge, IL); City Of Hope Medical Group Of Illinois PLLC (NPI 1548258072, Zion, IL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2009
## Record status
- **NPPES last updated:** October 19, 2018
- **Other identifiers:** Other 209008856 (IL)
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Source: [NPI Profile](https://npiprofile.com/npi/1972897791) · Data from the CMS NPPES public registry.