Jonathon Chapman, MD
NPI 1689867434 · Gastroenterology Physician · Baton Rouge, LA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jonathon Chapman, MD is a Gastroenterology Physician provider in Baton Rouge, LA (NPI 1689867434).
Provider details
- NPI number
- 1689867434
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 201621 (LA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
25 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 13 | $91 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 12 | $136 |
Typical Medicare-allowed amounts for these services range $91–$136 (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 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ustekinumabbrand: Stelara | 52 | — |
| Pantoprazole Sodium | 50 | 13 |
| Risankizumab-Rzaabrand: Skyrizi On-Body | 38 | 12 |
| Adalimumabbrand: Humira(cf) Pen | 30 | — |
| Colestipol Hcl | 27 | — |
| Sod Picosulf/Mag Ox/Citric Acbrand: Clenpiq | 23 | 23 |
| Infliximabbrand: Remicade |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$152,566 across 307 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
Registry dates
- Enumerated
- 2007-08-24
- Last updated
- 2014-11-09
Frequently asked questions
- What is Jonathon Chapman's NPI number?
- Jonathon Chapman's National Provider Identifier (NPI) is 1689867434, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jonathon Chapman's specialty?
- Jonathon Chapman is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Jonathon Chapman located?
- Jonathon Chapman's practice location on file with NPPES is 9103 Jefferson Hwy, Baton Rouge, LA 70809-2440.
- What is Jonathon Chapman's phone number?
- The practice phone number listed in the NPPES registry for Jonathon Chapman is (225) 927-1190.
- Does Jonathon Chapman accept Medicare?
- Jonathon Chapman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jonathon Chapman's NPI active?
- Yes — Jonathon Chapman's NPI (1689867434) is active in the NPPES registry as of the last update on 2014-11-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.