Johne Chapman, MD
NPI 1942734520 · Emergency Medicine Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Johne Chapman, MD is a Emergency Medicine Physician provider in Chicago, IL (NPI 1942734520).
Provider details
- NPI number
- 1942734520
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 01083826A (IN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
9 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
812 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 380 | $118 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 274 | $171 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 76 | $8 |
| Critical Care, First 30-74 Minutes99291 | 65 | $204 |
| Emergency Department Visit With Low Level of Medical Decision Making99283 | 17 | $70 |
Typical Medicare-allowed amounts for these services range $8–$204 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cephalexin | 45 | 44 |
| Naproxen | 32 | 31 |
| Prednisone | 23 | 20 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 21 | 21 |
| Ondansetron Hcl | 18 | 17 |
| Meclizine Hcl | 12 | 12 |
| Nystatin | 12 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$30 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 520 S Maple AveOak Park, IL 60304-1022Phone: (708) 660-5997
Registry dates
- Enumerated
- 2017-04-20
- Last updated
- 2023-05-24
- Certified
- 2023-05-24
Frequently asked questions
- What is Johne Chapman's NPI number?
- Johne Chapman's National Provider Identifier (NPI) is 1942734520, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Johne Chapman's specialty?
- Johne Chapman is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Johne Chapman located?
- Johne Chapman's practice location on file with NPPES is 1740 W Taylor St, Chicago, IL 60612-7232.
- What is Johne Chapman's phone number?
- The practice phone number listed in the NPPES registry for Johne Chapman is (866) 600-2273.
- Does Johne Chapman accept Medicare?
- Johne Chapman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Johne Chapman's NPI active?
- Yes — Johne Chapman's NPI (1942734520) is active in the NPPES registry as of the last update on 2023-05-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.