James Lengemann, MD
NPI 1447247572 · Internal Medicine Physician · Naperville, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Lengemann, MD is a Internal Medicine Physician provider in Naperville, IL (NPI 1447247572).
Provider details
- NPI number
- 1447247572
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036096442 (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
20 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
680 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 | 280 | $134 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 132 | $139 |
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 | 124 | $66 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 47 | $95 |
| Hemoglobin A1c Level83036 | 40 | $10 |
| Administration of Influenza Virus VaccineG0008 | 30 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 40 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 224 | 66 |
| Amlodipine Besylate | 199 | 60 |
| Losartan Potassium | 159 | 47 |
| Levothyroxine Sodium | 123 | 34 |
| Metoprolol Succinate | 102 | 33 |
| Pravastatin Sodium | 84 | 25 |
| Metformin Hcl |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$368 across 3 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
- 2005-10-04
- Last updated
- 2021-03-05
- Certified
- 2021-03-05
Frequently asked questions
- What is James Lengemann's NPI number?
- James Lengemann's National Provider Identifier (NPI) is 1447247572, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Lengemann's specialty?
- James Lengemann is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is James Lengemann located?
- James Lengemann's practice location on file with NPPES is 1331 W 75th St Ste 201, Naperville, IL 60540-9311.
- What is James Lengemann's phone number?
- The practice phone number listed in the NPPES registry for James Lengemann is (630) 527-5000.
- Does James Lengemann accept Medicare?
- James Lengemann is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Lengemann's NPI active?
- Yes — James Lengemann's NPI (1447247572) is active in the NPPES registry as of the last update on 2021-03-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.