NPI registry status
Active
2026 NPPES data Sleep Medicine (Internal Medicine) Physician NPI 1366860421 DO
Verify on CMS → David Delapp, DO
Sleep Medicine (Internal Medicine) Physician in Winfield, 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 859 in Sleep Medicine (Internal Medicine) 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 · 348 beneficiaries · Sleep Medicine (Internal Medicine) Physician avg: 1K
Generic prescribing
0%
generic claims · 66% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$92.21
2 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
David Delapp, DO filed 1,428 Medicare Part D claims in 2023 as a Sleep Medicine (Internal Medicine) Physician in Winfield, Illinois, prescribing 0% generic.
- 1K
- Part D claims, 2023
- 0%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
David Delapp, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,428 Top 20% higher than 80% 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
✓
Board certification likely (heuristic, not verified)
David Delapp, DO 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 David Delapp, DO?
Quality data not reportedPrimary specialty
Sleep Medicine (Internal Medicine) Physician
Medicare Part D claims
1,428 9% vs specialty avg
Specialty distribution in Illinois
How Sleep Medicine (Internal Medicine) 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 Sleep Medicine (Internal Medicine) 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).
David Delapp, DO appears in the CMS NPPES registry as a Sleep Medicine (Internal Medicine) Physician provider holding DO credentials at 25 N WINFIELD RD STE 204, Winfield, IL, 60190, with a listed phone of (630) 232-0202. NPI 1366860421 was issued on 04/04/2014.
Medicare Part D records for calendar year 2023 show 1,428 prescription claims written by this provider, covering 348 Medicare beneficiaries and totaling roughly $633K in drug spend, split 66% brand-name and 0% generic by claim count.
Sleep Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 859 enrolled providers across 52 states and an average of 1,310 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 | 1366860421 |
|---|---|
| Specialty | Sleep Medicine (Internal Medicine) Physician |
| Credentials | DO |
| Gender | Male |
| NPI Issued | 04/04/2014 |
Hospital and facility affiliations
Facilities where David Delapp, DO 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.
Central Dupage Physician Group
Winfield, 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 David Delapp, DO. Source: openpaymentsdata.cms.gov.
Total received
$92
Largest payer
Inspire Medical Systems, 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 David Delapp, DO. To verify David Delapp, DO'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 · Brand-heavy
David Delapp, DO - brand share 66.0%
Sleep Medicine (Internal Medicine) Physician average
66% brand-name claims vs 0% generic, on 1,428 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.
1,428
Total Claims
$633K
Total Drug Cost
348
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,152
- Total Day Supply
- 59,694
- Brand vs Generic
- 66% brand / 0% generic
- Brand Drug Cost
- $584K
- Antibiotic Claims
- 59
Patient Demographics
- Average Patient Age
- 74.6 years
- Avg HCC Risk Score
- 1.64
- Gender Split
- 58% female / 42% male
- Age Distribution
- <65: 25, 65-74: 142, 75-84: 138, 85+: 43
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What David Delapp, DO prescribes most
Top Medicare Part D drugs by claim count, 2023
- Albuterol Sulfate …
Albuterol Sulfate Hfa
230 claims
- Trelegy Ellipta
Trelegy Ellipta
127 claims
- Breo Ellipta
Breo Ellipta
110 claims
- Prednisone
Prednisone
95 claims
- Symbicort 67
Symbicort
67 claims
- Anoro Ellipta 61
Anoro Ellipta
61 claims
- Fluticasone Propio… 51
Fluticasone Propionate
51 claims
- Incruse Ellipta 46
Incruse Ellipta
46 claims
| Drug | Claims |
|---|---|
| Albuterol Sulfate Hfa Albuterol Sulfate | 230 |
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 127 |
| Breo Ellipta Fluticasone/Vilanterol | 110 |
| Prednisone | 95 |
| Symbicort Budesonide/Formoterol Fumarate | 67 |
| Anoro Ellipta Umeclidinium Brm/Vilanterol Tr | 61 |
| Fluticasone Propionate | 51 |
| Incruse Ellipta Umeclidinium Bromide | 46 |
| Stiolto Respimat Tiotropium Br/Olodaterol Hcl | 43 |
| Ventolin Hfa Albuterol Sulfate | 38 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Sleep Medicine (Internal Medicine) Physician in IL →
All providers in Illinois →
Compare specialties →
Sleep Medicine (Internal Medicine) Physician Overview
How David Delapp, DO fits within the Sleep Medicine (Internal Medicine) Physician landscape nationally.
859
Sleep Medicine (Internal Medicine) Physician Providers in US
52
States with Sleep Medicine (Internal Medicine) Physician
1,310
Avg Claims per Provider
David Delapp, DO's 1,428 claims are above the specialty average of 1,310.
Nearby Sleep Medicine (Internal Medicine) Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Delapp.
Dr. Philip Abraham
M.D.
Springfield, IL
Dr. Mirza Abu Sayeem
MBBS
Chicago, IL
Dr. Noman Baig
MD
Chicago, IL
Dr. George Cromydas
M.D.
Arlington Heights, IL
Richard Czuma
Palos Heights, IL
Compare Sleep Medicine (Internal Medicine) Physician 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 Sleep Medicine (Internal Medicine) Physician 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.
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Frequently Asked Questions
What is David Delapp, DO's specialty? ▼
David Delapp, DO specializes in Sleep Medicine (Internal Medicine) Physician and practices in Winfield, Illinois. Credentials: DO.
How much does David Delapp, DO prescribe under Medicare Part D? ▼
In 2023, David Delapp, DO wrote 1,428 Medicare Part D claims totaling $633K in drug costs for 348 beneficiaries.
Where is David Delapp, DO located? ▼
David Delapp, DO is located at 25 N WINFIELD RD STE 204, Winfield, IL, 60190. Phone: (630) 232-0202.
What is David Delapp, DO's NPI number? ▼
David Delapp, DO's National Provider Identifier (NPI) is 1366860421, issued on 04/04/2014.
Does David Delapp, DO prescribe more brand-name or generic drugs? ▼
David Delapp, DO's prescribing is 66% brand-name and 0% generic drugs by claim count, with $584K in brand drug costs.
How many Sleep Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 859 Sleep Medicine (Internal Medicine) Physician providers across 52 states in the US. The average Sleep Medicine (Internal Medicine) Physician provider writes 1,310 Medicare Part D claims per year.
What drugs does David Delapp, DO prescribe most often? ▼
Based on 2023 Medicare Part D data, David Delapp, DO's most frequently prescribed drugs include Albuterol Sulfate Hfa, Trelegy Ellipta, Breo Ellipta. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does David Delapp, DO accept Medicare? ▼
David Delapp, DO appears in CMS Medicare data with 1,428 Part D claims and 348 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify David Delapp, DO's credentials? ▼
David Delapp, DO's NPI is 1366860421 with credentials DO. 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.