NPI registry status
Active
2026 NPPES data Nurse Practitioner NPI 1588273916 APN
Verify on CMS → Mary Bierman, APN
Nurse Practitioner in Effingham, Illinois.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 87,700 in Nurse Practitioner, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
282
Medicare Part D claims · 91 beneficiaries · Nurse Practitioner avg: 1K
Generic prescribing
74%
generic claims · 26% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$450.96
17 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Mary Bierman, APN filed 282 Medicare Part D claims in 2023 as a Nurse Practitioner in Effingham, Illinois, prescribing 74% generic.
- 282
- Part D claims, 2023
- 74%
- generic prescribing
- $450.96
- industry payments (Sunshine Act)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Mary Bierman, APN's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
282 49th percentile higher than 49% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Mary Bierman, APN?
Quality data not reportedPrimary specialty
Nurse Practitioner
Medicare Part D claims
282 74% vs specialty avg
Specialty distribution in Illinois
How Nurse Practitioner compares to other specialties among Illinois providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Nurse Practitioner. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Mary Bierman, APN appears in the CMS NPPES registry as a Nurse Practitioner provider holding APN credentials at 912 N HENRIETTA ST, Effingham, IL, 62401, with a listed phone of (217) 342-3337. NPI 1588273916 was issued on 07/31/2020.
Medicare Part D records for calendar year 2023 show 282 prescription claims written by this provider, covering 91 Medicare beneficiaries and totaling roughly $36K in drug spend, split 26% brand-name and 74% generic by claim count.
Nurse Practitioner is a high-volume specialty nationwide, with 87,700 enrolled providers across 56 states and an average of 1,084 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1588273916 |
|---|---|
| Specialty | Nurse Practitioner |
| Credentials | APN |
| Gender | Female |
| NPI Issued | 07/31/2020 |
Hospital and facility affiliations
Facilities where Mary Bierman, APN bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Effingham Obstetrics And Gynecology Associates PLLC
Effingham, IL
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Mary Bierman, APN. Source: openpaymentsdata.cms.gov.
Total received
$451
Largest payer
Amgen Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - Illinois IDFPR 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~42K Illinois medical licensees in 2023 - they are NOT specific to Mary Bierman, APN. To verify Mary Bierman, APN's current license status, search the IDFPR public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
106
Total board actions, Illinois 2023
Across 103 cases
2.52
Actions per 1,000 licensees
Illinois statewide rate
probation
Most common action type
38 cases
IDFPR publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Illinois disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Above average
Mary Bierman, APN - brand share 26.0%
Nurse Practitioner average
26% brand-name claims vs 74% generic, on 282 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
282
Total Claims
$36K
Total Drug Cost
91
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 408
- Total Day Supply
- 10,074
- Brand vs Generic
- 26% brand / 74% generic
- Brand Drug Cost
- $28K
- Generic Drug Cost
- $8K
- Antibiotic Claims
- 49
Patient Demographics
- Average Patient Age
- 69.8 years
- Avg HCC Risk Score
- 1.04
- Gender Split
- 100% female / 0% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mary Bierman, APN prescribes most
Top Medicare Part D drugs by claim count, 2023
- Gemtesa
Gemtesa
29 claims
- Estradiol
Estradiol
25 claims
- Oxybutynin Chlorid…
Oxybutynin Chloride Er
24 claims
- Imvexxy
Imvexxy
23 claims
- Nitrofurantoin Mon…
Nitrofurantoin Mono-Macro
20 claims
- Fluconazole
Fluconazole
13 claims
- Oxybutynin Chloride
Oxybutynin Chloride
13 claims
- Larin Fe
Larin Fe
12 claims
| Drug | Claims |
|---|---|
| Gemtesa Vibegron | 29 |
| Estradiol | 25 |
| Oxybutynin Chloride Er Oxybutynin Chloride | 24 |
| Imvexxy Estradiol | 23 |
| Nitrofurantoin Mono-Macro Nitrofurantoin Monohyd/M-Cryst | 20 |
| Fluconazole | 13 |
| Oxybutynin Chloride | 13 |
| Larin Fe Norethindrone-E.Estradiol-Iron | 12 |
| Metronidazole | 11 |
| Premarin "Estrogens | N/A |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nurse Practitioner Overview
How Mary Bierman, APN fits within the Nurse Practitioner landscape nationally.
87,700
Nurse Practitioner Providers in US
56
States with Nurse Practitioner
1,084
Avg Claims per Provider
Mary Bierman, APN's 282 claims are below the specialty average of 1,084.
Nearby Nurse Practitioner Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Bierman.
Dr. Janice Abadilla
FNP-BC
Peoria, IL
Dr. Roseviminda Abano
CNP
Gurnee, IL
Philomena Abebe
Park Ridge, IL
Dr. Milagros Abellera
APN
Chicago, IL
Dr. Edwina Abloh
APN-CNP
Skokie, IL
Compare Nurse Practitioner nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Illinois medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Nurse Practitioner peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
Healthcare Guides
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Medical Specialties Explained
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Understanding Medicare Claims Data
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How insurance networks affect your costs
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Frequently Asked Questions
What is Mary Bierman, APN's specialty? ▼
Mary Bierman, APN specializes in Nurse Practitioner and practices in Effingham, Illinois. Credentials: APN.
How much does Mary Bierman, APN prescribe under Medicare Part D? ▼
In 2023, Mary Bierman, APN wrote 282 Medicare Part D claims totaling $36K in drug costs for 91 beneficiaries.
Where is Mary Bierman, APN located? ▼
Mary Bierman, APN is located at 912 N HENRIETTA ST, Effingham, IL, 62401. Phone: (217) 342-3337.
What is Mary Bierman, APN's NPI number? ▼
Mary Bierman, APN's National Provider Identifier (NPI) is 1588273916, issued on 07/31/2020.
Does Mary Bierman, APN prescribe more brand-name or generic drugs? ▼
Mary Bierman, APN's prescribing is 26% brand-name and 74% generic drugs by claim count, with $28K in brand drug costs.
How many Nurse Practitioner providers are there in the US? ▼
There are 87,700 Nurse Practitioner providers across 56 states in the US. The average Nurse Practitioner provider writes 1,084 Medicare Part D claims per year.
What drugs does Mary Bierman, APN prescribe most often? ▼
Based on 2023 Medicare Part D data, Mary Bierman, APN's most frequently prescribed drugs include Gemtesa, Estradiol, Oxybutynin Chloride Er. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mary Bierman, APN accept Medicare? ▼
Mary Bierman, APN appears in CMS Medicare data with 282 Part D claims and 91 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mary Bierman, APN's credentials? ▼
Mary Bierman, APN's NPI is 1588273916 with credentials APN. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.