Quick answers
- Does Lorenzo W. Klein accept Medicare assignment?
- Yes. Medicare's clinician data says Lorenzo W. Klein 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 Lorenzo W. Klein see?
- In 2024, CMS data shows 91 Original Medicare patients and 192 services for Lorenzo W. Klein. This counts Original Medicare only and measures volume, not quality.
- What is Lorenzo W. Klein's NPI number?
- 1659489680. 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 Lorenzo W. Klein, 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 | 91 |
|---|---|
| Services billed to Medicare | 192 |
| Different services or procedures | 19 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Critical care, first 30-74 minutes (99291)88 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)22 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)14 services
- Insertion of non-tunneled central venous tube for infusion (5 years or older) (36556)11 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 blood pressure75%
- High cholesterol75%
- Heart failure63%
- Arthritis53%
- Chronic kidney disease51%
- Diabetes48%
Hospitals where Lorenzo W. Klein works
Medicare's Facility Affiliation Data lists Lorenzo W. Klein at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Mount Auburn HospitalCambridge, MA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 220002
- Newton-Wellesley HospitalNewton, MA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 220101
- Southern NH Medical CenterNashua, NH · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 300020
Practice locations
Addresses where Lorenzo W. Klein is enrolled with Medicare (CMS data updated October 2, 2026).
- 10 Prospect St, Suite 202Nashua, NH 03060 (603) 886‑7900
- 2014 Washington StNewton, MA 02462 (617) 243‑6000
- 330 Mount Auburn StCambridge, MA 02138 (617) 499‑5020
Group practices
Medicare enrollment lists Lorenzo W. Klein as a member of these groups (CMS data updated October 2, 2026).
- Mass General Brigham Medical Group Suburban Massachusetts Inc602 clinicians in the group
- Foundation Medical Partners Inc317 clinicians in the group
- Mount Auburn Professional Services Inc231 clinicians in the group
Specialties
Other pulmonologists in Nashua
Clinicians with the same Medicare primary specialty in Nashua, NH — not a recommendation.
Other clinicians in Mass General Brigham Medical Group Suburban Massachusetts Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2002 (24 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1659489680 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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