Jonathon Leja, MD
NPI 1134758782 · Geriatric Medicine (Internal Medicine) Physician · Madison, WI
Enrolled with Medicare as Practitioner - Geriatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jonathon Leja, MD is a Geriatric Medicine (Internal Medicine) Physician provider in Madison, WI (NPI 1134758782).
Provider details
- NPI number
- 1134758782
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 76980-20 (WI)
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 tenure28% of score
6 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
176 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 82 | $73 |
| Prolonged Hospital Inpatient Or Observation Care Evaluation and Management Service(s) Beyond the Total Time for the Primary Service (when the Primary Service Has Been Selected Using Time on the Date of the Primary Service); Each Additional 15 Minutes By ThG0316 | 48 | $28 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 46 | $161 |
Typical Medicare-allowed amounts for these services range $28–$161 (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 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Oxycodone Hcl | 51 | 11 |
| Diclofenac Sodium | 41 | — |
| Insulin Glargine,hum.rec.anlogbrand: Basaglar Kwikpen U-100 | 29 | — |
| Chlorhexidine Gluconate | 26 | — |
| Amlodipine Besylate | 21 | — |
| Morphine Sulfate | 19 | — |
| Insulin Aspartbrand: Novolog Flexpen | 16 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-04-06
- Last updated
- 2024-12-11
- Certified
- 2024-12-11
Frequently asked questions
- What is Jonathon Leja's NPI number?
- Jonathon Leja's National Provider Identifier (NPI) is 1134758782, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jonathon Leja's specialty?
- Jonathon Leja is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Jonathon Leja located?
- Jonathon Leja's practice location on file with NPPES is 600 Highland Ave, Madison, WI 53792-0001.
- What is Jonathon Leja's phone number?
- The practice phone number listed in the NPPES registry for Jonathon Leja is (608) 263-0572.
- Does Jonathon Leja accept Medicare?
- Jonathon Leja is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jonathon Leja's NPI active?
- Yes — Jonathon Leja's NPI (1134758782) is active in the NPPES registry as of the last update on 2024-12-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.