NPI registry status
Active
2026 NPPES data Adult Health Nurse Practitioner NPI 1396037685 NP
Verify on CMS → Diana Guillaume, NP
Adult Health Nurse Practitioner in Skokie, 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 29,811 in Adult Health 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
7K
Medicare Part D claims · 597 beneficiaries · Adult Health Nurse Practitioner avg: 1K
Generic prescribing
88%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Diana Guillaume, NP filed 7,136 Medicare Part D claims in 2024 as an Adult Health Nurse Practitioner in Skokie, Illinois, prescribing 88% generic.
- 7K
- Part D claims, 2024
- 88%
- generic prescribing
- ≥96th
- pct by Part D claim volume (lower-bound band)
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.
Federal trust snapshot
What official records show about Diana Guillaume, NP
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1396037685), first enumerated 05/05/2011.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 7,136 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
Illinois statewide board action statistics are published annually — these figures describe aggregate state activity, not Diana Guillaume, NP's individual license status. Verify directly with the state medical board.
Source: IDFPR annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1396037685 · Adult Health Nurse Practitioner
NPI-10 · ENUM-MID · TAX-MID · RX-MID · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1396037685
- ENUM-MID 2011
- TAX-MID 30K Adult Health
- RX-MID 7,136
- BOOK-LIGHT 766 in Illinois
- PHOTO-ENUM Sarah Larson · 2011
Diana Guillaume, NP's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
7,136 ≥ 96th percentile 96% of 1,416,883 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
What does the federal data show about Diana Guillaume, NP?
Quality data not reportedPrimary specialty
Adult Health Nurse Practitioner
Medicare Part D claims
7,136 6× vs specialty avg
Specialty distribution in Illinois
How Adult Health 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 Adult Health 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).
Practice Address
Provider Details
| NPI | 1396037685 |
|---|---|
| Specialty | Adult Health Nurse Practitioner |
| Credentials | NP |
| Gender | Female |
| NPI Issued | 05/05/2011 |
Hospital and facility affiliations
Facilities where Diana Guillaume, NP 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.
Oak Street Health Physicians Group PC
Chicago, 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).
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 Diana Guillaume, NP. To verify Diana Guillaume, NP'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 · Typical
Diana Guillaume, NP - brand share 11.0%
Adult Health Nurse Practitioner average
11% brand-name claims vs 88% generic, on 7,136 2024 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 2024.
7,136
Total Claims
$760K
Total Drug Cost
597
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 18,329.433
- Total Day Supply
- 544,881
- Brand vs Generic
- 11% brand / 88% generic
- Brand Drug Cost
- $660K
- Generic Drug Cost
- $96K
- Opioid Claims
- 14 (0.2% rate)
- Antibiotic Claims
- 52
Patient Demographics
- Average Patient Age
- 74.1 years
- Avg HCC Risk Score
- 1.86
- Gender Split
- 60% female / 40% male
- Age Distribution
- <65: 49, 65-74: 269, 75-84: 232, 85+: 47
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Diana Guillaume, NP prescribes most
Top Medicare Part D drugs by claim count, 2024
- Atorvastatin Calcium
Atorvastatin Calcium
835 claims
- Metformin Hcl
Metformin Hcl
396 claims
- Amlodipine Besylate 315
Amlodipine Besylate
315 claims
- Lisinopril 272
Lisinopril
272 claims
- Gabapentin 226
Gabapentin
226 claims
- Rosuvastatin Calcium 224
Rosuvastatin Calcium
224 claims
- Metoprolol Succinate 199
Metoprolol Succinate
199 claims
- Losartan Potassium 185
Losartan Potassium
185 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 835 |
| Metformin Hcl | 396 |
| Amlodipine Besylate | 315 |
| Lisinopril | 272 |
| Gabapentin | 226 |
| Rosuvastatin Calcium | 224 |
| Metoprolol Succinate | 199 |
| Losartan Potassium | 185 |
| Omeprazole | 185 |
| Levothyroxine Sodium | 173 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Adult Health Nurse Practitioner Overview
How Diana Guillaume, NP fits within the Adult Health Nurse Practitioner landscape nationally.
29,811
Adult Health Nurse Practitioner Providers in US
55
States with Adult Health Nurse Practitioner
1,291
Avg Claims per Provider
Diana Guillaume, NP's 7,136 claims are above the specialty average of 1,291.
Nationwide Adult Health Nurse Practitioner peers with similar MIPS or enrollment year
Two federal-record peer sets for Guillaume, both outside Illinois so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2011)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Adult Health Nurse Practitioner Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Guillaume.
One of 766 Adult Health Nurse Practitioner providers enrolled in Illinois, 5 are shown here.
Gloria Abenes
NP
Mount Vernon, IL
Annamma Abraham
NP
Elmhurst, IL
Sara Acosta
FNP-C
Long Grove, IL
Sara Adams
ANP
Chicago, IL
Cathy Adamson
N.P.
Elmhurst, IL
Compare Adult Health Nurse Practitioner nationally: see state-by-state distribution →
Frequently Asked Questions
What is Diana Guillaume, NP's specialty? ▼
Diana Guillaume, NP specializes in Adult Health Nurse Practitioner and practices in Skokie, Illinois. Credentials: NP.
How much does Diana Guillaume, NP prescribe under Medicare Part D? ▼
In 2024, Diana Guillaume, NP wrote 7,136 Medicare Part D claims totaling $760K in drug costs for 597 beneficiaries.
Where is Diana Guillaume, NP located? ▼
Diana Guillaume, NP is located at 4120 DEMPSTER ST, Skokie, IL, 60076. Phone: (224) 601-7032.
What is Diana Guillaume, NP's NPI number? ▼
Diana Guillaume, NP's National Provider Identifier (NPI) is 1396037685, issued on 05/05/2011.
Does Diana Guillaume, NP prescribe more brand-name or generic drugs? ▼
Diana Guillaume, NP's prescribing is 11% brand-name and 88% generic drugs by claim count, with $660K in brand drug costs.
Does Diana Guillaume, NP prescribe opioids? ▼
Yes, Diana Guillaume, NP had 14 opioid claims in 2024 with an opioid prescribing rate of 0.2%.
How many Adult Health Nurse Practitioner providers are there in the US? ▼
There are 29,811 Adult Health Nurse Practitioner providers across 55 states in the US. The average Adult Health Nurse Practitioner provider writes 1,291 Medicare Part D claims per year.
What drugs does Diana Guillaume, NP prescribe most often? ▼
Based on 2024 Medicare Part D data, Diana Guillaume, NP's most frequently prescribed drugs include Atorvastatin Calcium, Metformin Hcl, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Diana Guillaume, NP accept Medicare? ▼
Diana Guillaume, NP appears in CMS Medicare data with 7,136 Part D claims and 597 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Diana Guillaume, NP's credentials? ▼
Diana Guillaume, NP's NPI is 1396037685 with credentials NP. 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 (2024). 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 August 2026 (NPPES) / 2024 (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
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 August 2026.