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 932 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
2K
Medicare Part D claims · 390 beneficiaries · Sleep Medicine (Internal Medicine) Physician avg: 1K
Generic prescribing
35%
generic claims · 65% 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, 2024
What the federal data shows
David Delapp, DO filed 1,834 Medicare Part D claims in 2024 as a Sleep Medicine (Internal Medicine) Physician in Winfield, Illinois, prescribing 35% generic.
- 2K
- Part D claims, 2024
- 35%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥83rd
- 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 David Delapp, DO
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 1366860421), first enumerated 04/04/2014.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,834 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
- Reported
Industry payment transparency
$92.21 in reported industry payments (2 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
Illinois statewide board action statistics are published annually — these figures describe aggregate state activity, not David Delapp, DO'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 1366860421 · Sleep Medicine (Internal Medicine) Physician
NPI-10 · ENUM-MID · TAX-NARROW · RX-MID · BOOK-THIN · PHOTO-ENUM
- NPI-10 1366860421
- ENUM-MID 2014
- TAX-NARROW 932
- RX-MID 1,834
- BOOK-THIN 32 in Illinois
- PHOTO-ENUM Robert Stretch · 2014
David Delapp, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
1,834 ≥ 83rd percentile 83% 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)
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
1,834 42% 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).
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 65.0%
Sleep Medicine (Internal Medicine) Physician average
65% brand-name claims vs 35% generic, on 1,834 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.
1,834
Total Claims
$886K
Total Drug Cost
390
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,941.667
- Total Day Supply
- 83,057
- Brand vs Generic
- 65% brand / 35% generic
- Brand Drug Cost
- $855K
- Generic Drug Cost
- $31K
- Antibiotic Claims
- 80
Patient Demographics
- Average Patient Age
- 74.6 years
- Avg HCC Risk Score
- 1.71
- Gender Split
- 57% female / 43% male
- Age Distribution
- <65: 27, 65-74: 165, 75-84: 155, 85+: 43
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What David Delapp, DO prescribes most
Top Medicare Part D drugs by claim count, 2024
- Albuterol Sulfate …
Albuterol Sulfate Hfa
270 claims
- Trelegy Ellipta
Trelegy Ellipta
207 claims
- Breo Ellipta
Breo Ellipta
180 claims
- Anoro Ellipta
Anoro Ellipta
124 claims
- Stiolto Respimat 101
Stiolto Respimat
101 claims
- Fluticasone-Salmet… 96
Fluticasone-Salmeterol
96 claims
- Montelukast Sodium 71
Montelukast Sodium
71 claims
- Prednisone 69
Prednisone
69 claims
| Drug | Claims |
|---|---|
| Albuterol Sulfate Hfa Albuterol Sulfate | 270 |
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 207 |
| Breo Ellipta Fluticasone/Vilanterol | 180 |
| Anoro Ellipta Umeclidinium Brm/Vilanterol Tr | 124 |
| Stiolto Respimat Tiotropium Br/Olodaterol Hcl | 101 |
| Fluticasone-Salmeterol Fluticasone Propion/Salmeterol | 96 |
| Montelukast Sodium | 71 |
| Prednisone | 69 |
| Arnuity Ellipta Fluticasone Furoate | 48 |
| Azithromycin | 48 |
* 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.
932
Sleep Medicine (Internal Medicine) Physician Providers in US
52
States with Sleep Medicine (Internal Medicine) Physician
1,288
Avg Claims per Provider
David Delapp, DO's 1,834 claims are above the specialty average of 1,288.
Nationwide Sleep Medicine (Internal Medicine) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Delapp, both outside Illinois so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2014)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
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.
One of 32 Sleep Medicine (Internal Medicine) Physician providers enrolled in Illinois, 5 are shown here.
Dr. Jehad Abdalla
MD
Chicago, IL
Dr. Philip Abraham
M.D.
Springfield, IL
Dr. Noman Baig
MD
Schaumburg, 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 →
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 2024, David Delapp, DO wrote 1,834 Medicare Part D claims totaling $886K in drug costs for 390 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 65% brand-name and 35% generic drugs by claim count, with $855K in brand drug costs.
How many Sleep Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 932 Sleep Medicine (Internal Medicine) Physician providers across 52 states in the US. The average Sleep Medicine (Internal Medicine) Physician provider writes 1,288 Medicare Part D claims per year.
What drugs does David Delapp, DO prescribe most often? ▼
Based on 2024 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 1,834 Part D claims and 390 Medicare beneficiaries in 2024. 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 (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.