Mary Ann Holem, FNP-BC
Family Nurse Practitioner · Crystal Lake, IL
Mary Ann Holem, FNP-BC is a family nurse practitioner with a practice address in Crystal Lake, Illinois, and NPI 1972897791, issued on Jun 9, 2011. Check the license (Illinois 209008856, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mary Ann Holem
- Credential
- FNP-BC
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- 209008856 IL
Self-reported in NPPES; status is on the state search - Practice location
- 360 Station Dr, Crystal Lake, IL 60014
- Phone
- (815) 338-6600
- Enumerated
- Jun 9, 2011
- Record last updated
- Oct 19, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (815) 455-8044
- Medicare enrollment
- Enrolled (PECOS I20120220000445); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 7,639 in Illinois → Look up another NPI →
Also registered at 360 Station Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mary Ann Holem in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 209008856Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average family nurse practitioner in 2024
150 Medicare Part D claims for 113 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D.
Most prescribed
- Cephalexin18 claims
- Amoxicillin15 claims
- Amoxicillin-Clavulanate Potass13 claims
- Prednisone13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $203.35
2 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 99,489 providers of this specialty with any payment received $650.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Lake County Acute Care LLPGurnee, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Ann Holem among 7,639 family nurse practitioner records in Illinois
Mary Ann Holem, FNP-BC is one of 7,639 family nurse practitioner records with a practice address in Illinois. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 12% of them.
- NPI issued2011 · 12% of these records are older, 86% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2009 · median 2018 among the 4,778 with a school on file
- Record last updated2018 · 39% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
48 family nurse practitioner records list a practice address in Crystal Lake
They are 48 of the 1,442 NPPES records with a practice address in Crystal Lake, and 7,639 family nurse practitioner records in Illinois.
All 7,639 in Illinois → Every provider in Crystal Lake → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Michelle Bate, NPCrystal Lake, IL 600141134164270
- Christy Benton, A.P.N.Crystal Lake, IL 600141245342807
- Susan Bigham, CNPCrystal Lake, IL 600141518383264
- Jason Carman, DNPCrystal Lake, IL 600141174522825
- Juliana Gonzales-Hannon, CNPCrystal Lake, IL 600141285099622
- Jacki Liggett, APN, FNPCrystal Lake, IL 600141194102053
- Cynthia Macdonald, DNPCrystal Lake, IL 600141609988187
- Nancy Prokup, CNPCrystal Lake, IL 600141306155072
Common questions
What is Mary Ann Holem, FNP-BC's NPI number?
Mary Ann Holem, FNP-BC's National Provider Identifier (NPI) is 1972897791, issued on Jun 9, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Mary Ann Holem, FNP-BC located?
The NPPES record lists a practice address at 360 Station Dr, Crystal Lake, IL, 60014. Phone: (815) 338-6600. Providers update this record themselves, so call before visiting.
How can I verify Mary Ann Holem, FNP-BC's license?
NPPES lists Illinois license number 209008856, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does Mary Ann Holem, FNP-BC prescribe under Medicare Part D?
In 2024, Mary Ann Holem, FNP-BC had 150 Medicare Part D claims for 113 beneficiaries; the average among family nurse practitioner prescribers was 1,305. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.