NPI registry status
Active
2026 NPPES data Pediatric Allergy/Immunology Physician NPI 1891863411 MD
Verify on CMS → Ann Collier, MD
Pediatric Allergy/Immunology Physician in Oak Brook, 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 439 in Pediatric Allergy/Immunology Physician, 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
1K
Medicare Part D claims · 205 beneficiaries · Pediatric Allergy/Immunology Physician avg: 374
Generic prescribing
52%
generic claims · 48% 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
Ann Collier, MD filed 1,204 Medicare Part D claims in 2024 as a Pediatric Allergy/Immunology Physician in Oak Brook, Illinois, prescribing 52% generic.
- 1K
- Part D claims, 2024
- 52%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥78th
- 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 Ann Collier, MD
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 1891863411), first enumerated 12/01/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,204 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- 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 Ann Collier, MD'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 1891863411 · Pediatric Allergy/Immunology Physician
NPI-10 · ENUM-LEGACY · TAX-TRACE · RX-MID · BOOK-THIN · PHOTO-ENUM
- NPI-10 1891863411
- ENUM-LEGACY 2006
- TAX-TRACE 439
- RX-MID 1,204
- BOOK-THIN 22 in Illinois
- PHOTO-ENUM Christopher Healy, MD · 2006
Ann Collier, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
1,204 ≥ 78th percentile 78% 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
✓
Board certification likely (heuristic, not verified)
Ann Collier, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Ann Collier, MD?
Quality data not reportedPrimary specialty
Pediatric Allergy/Immunology Physician
Medicare Part D claims
1,204 222% vs specialty avg
Specialty distribution in Illinois
How Pediatric Allergy/Immunology Physician 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 Pediatric Allergy/Immunology Physician. 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 | 1891863411 |
|---|---|
| Specialty | Pediatric Allergy/Immunology Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 12/01/2006 |
Hospital and facility affiliations
Facilities where Ann Collier, MD 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.
Duke Health Integrated Practice Inc
Durham, NC
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 Ann Collier, MD. To verify Ann Collier, MD'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
Ann Collier, MD - brand share 48.0%
Pediatric Allergy/Immunology Physician average
48% brand-name claims vs 52% generic, on 1,204 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.
1,204
Total Claims
$935K
Total Drug Cost
205
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,929.133
- Total Day Supply
- 54,469
- Brand vs Generic
- 48% brand / 52% generic
- Brand Drug Cost
- $903K
- Generic Drug Cost
- $32K
Patient Demographics
- Average Patient Age
- 69.0 years
- Avg HCC Risk Score
- 1.11
- Gender Split
- 71% female / 29% male
- Age Distribution
- <65: 41, 65-74: 100, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Ann Collier, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Trelegy Ellipta
Trelegy Ellipta
156 claims
- Azelastine Hcl
Azelastine Hcl
119 claims
- Montelukast Sodium
Montelukast Sodium
109 claims
- Xolair
Xolair
73 claims
- Epinephrine
Epinephrine
72 claims
- Albuterol Sulfate …
Albuterol Sulfate Hfa
70 claims
- Breo Ellipta 51
Breo Ellipta
51 claims
- Dupixent Pen 48
Dupixent Pen
48 claims
| Drug | Claims |
|---|---|
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 156 |
| Azelastine Hcl | 119 |
| Montelukast Sodium | 109 |
| Xolair Omalizumab | 73 |
| Epinephrine | 72 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 70 |
| Breo Ellipta Fluticasone/Vilanterol | 51 |
| Dupixent Pen Dupilumab | 48 |
| Fluticasone Propionate | 43 |
| Prednisone | 42 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Pediatric Allergy/Immunology Physician in IL →
All providers in Illinois →
Compare specialties →
Pediatric Allergy/Immunology Physician Overview
How Ann Collier, MD fits within the Pediatric Allergy/Immunology Physician landscape nationally.
439
Pediatric Allergy/Immunology Physician Providers in US
44
States with Pediatric Allergy/Immunology Physician
374
Avg Claims per Provider
Ann Collier, MD's 1,204 claims are above the specialty average of 374.
Nationwide Pediatric Allergy/Immunology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Collier, both outside Illinois so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Pediatric Allergy/Immunology Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Collier.
One of 22 Pediatric Allergy/Immunology Physician providers enrolled in Illinois, 5 are shown here.
Dr. Sompongse Angspatt
M.D.
Oak Forest, IL
Dr. Sana Attar
M.D
Libertyville, IL
Dr. Sakina Bajowala
M.D.
North Aurora, IL
Dr. Ameeta Bamzai
MD
Naperville, IL
Brittany Bindon
Chicago, IL
Compare Pediatric Allergy/Immunology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Ann Collier, MD's specialty? ▼
Ann Collier, MD specializes in Pediatric Allergy/Immunology Physician and practices in Oak Brook, Illinois. Credentials: MD.
How much does Ann Collier, MD prescribe under Medicare Part D? ▼
In 2024, Ann Collier, MD wrote 1,204 Medicare Part D claims totaling $935K in drug costs for 205 beneficiaries.
Where is Ann Collier, MD located? ▼
Ann Collier, MD is located at 120 OAKBROOK CTR, Oak Brook, IL, 60523. Phone: (630) 574-0460.
What is Ann Collier, MD's NPI number? ▼
Ann Collier, MD's National Provider Identifier (NPI) is 1891863411, issued on 12/01/2006.
Does Ann Collier, MD prescribe more brand-name or generic drugs? ▼
Ann Collier, MD's prescribing is 48% brand-name and 52% generic drugs by claim count, with $903K in brand drug costs.
How many Pediatric Allergy/Immunology Physician providers are there in the US? ▼
There are 439 Pediatric Allergy/Immunology Physician providers across 44 states in the US. The average Pediatric Allergy/Immunology Physician provider writes 374 Medicare Part D claims per year.
What drugs does Ann Collier, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Ann Collier, MD's most frequently prescribed drugs include Trelegy Ellipta, Azelastine Hcl, Montelukast Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ann Collier, MD accept Medicare? ▼
Ann Collier, MD appears in CMS Medicare data with 1,204 Part D claims and 205 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ann Collier, MD's credentials? ▼
Ann Collier, MD's NPI is 1891863411 with credentials MD. 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.