Quick answers
- Does Klaus Dieter K. Lessnau accept Medicare assignment?
- Yes. Medicare's clinician data says Klaus Dieter K. Lessnau accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Klaus Dieter K. Lessnau see?
- In 2024, CMS data shows 154 Original Medicare patients and 1,065 services for Klaus Dieter K. Lessnau. This counts Original Medicare only and measures volume, not quality.
- What is Klaus Dieter K. Lessnau's NPI number?
- 1083684708. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Klaus Dieter K. Lessnau, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 154 |
|---|---|
| Services billed to Medicare | 1,065 |
| Different services or procedures | 36 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Test to measure expiratory airflow and volume changes before and after medication administration (94060)137 services
- Test to determine lung volumes using gas dilution or washout (94727)90 services
- Test to examine how well the lungs exchange gases (94729)90 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)71 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)55 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure72%
- Arthritis55%
- Ischemic heart disease38%
- COPD38%
- Asthma33%
Practice locations
Addresses where Klaus Dieter K. Lessnau is enrolled with Medicare (CMS data updated October 2, 2026).
- 1041 3rd Ave, Suite 203New York, NY 10065 (212) 583‑2969
- 332 E 14th StNew York, NY 10003 (212) 481‑3333
Group practices
Medicare enrollment lists Klaus Dieter K. Lessnau as a member of these groups (CMS data updated October 2, 2026).
- 14 Street Medical PC16 clinicians in the group
- Diego a Diaz MD PC2 clinicians in the group
Specialties
- Pulmonary Diseaseprimary
- Critical Care (Intensivists)also
- Internal Medicinealso
- Sleep Medicinealso
Other pulmonologists in New York
Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.
Other clinicians in 14 Street Medical PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1985 (41 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1083684708 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians