Lillian De Leon, MD
NPI 1134142193 · Internal Medicine Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lillian De Leon, MD is a Internal Medicine Physician provider in Chicago, IL (NPI 1134142193).
Provider details
- NPI number
- 1134142193
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- 036089949 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 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
527 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 318 | $93 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 86 | $131 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 45 | $133 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 21 | $59 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 18 | $93 |
| Physician Or Allowed Practitioner Re-Certification for Medicare-Covered Home Health Services Under a Home Health Plan of Care (patient Not Present), Including Contacts With Home Health Agency and Review of Reports of Patient Status Required By Physicians a |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 104 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 501 | 132 |
| Metoprolol Succinate | 332 | 79 |
| Amlodipine Besylate | 315 | 76 |
| Losartan Potassium | 227 | 72 |
| Nifedipinebrand: Nifedipine Er | 204 | 42 |
| Levothyroxine Sodium | 180 | 34 |
| Ezetimibe |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,337 across 61 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
- 2006-07-25
- Last updated
- 2025-01-12
- Certified
- 2025-01-12
Frequently asked questions
- What is Lillian De Leon's NPI number?
- Lillian De Leon's National Provider Identifier (NPI) is 1134142193, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lillian De Leon's specialty?
- Lillian De Leon is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Lillian De Leon located?
- Lillian De Leon's practice location on file with NPPES is 2701 W 68th St, Chicago, IL 60629-1813.
- What is Lillian De Leon's phone number?
- The practice phone number listed in the NPPES registry for Lillian De Leon is (773) 884-7922.
- Does Lillian De Leon accept Medicare?
- Lillian De Leon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lillian De Leon's NPI active?
- Yes — Lillian De Leon's NPI (1134142193) is active in the NPPES registry as of the last update on 2025-01-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.