Karen Lasser, M.D.
NPI 1932235520 · Internal Medicine Physician · Boston, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Lasser, M.D. is a Internal Medicine Physician provider in Boston, MA (NPI 1932235520).
Provider details
- NPI number
- 1932235520
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 145353 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 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
112 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 79 | $102 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 33 | $69 |
Typical Medicare-allowed amounts for these services range $69–$102 (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 · 83 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 312 | 71 |
| Amlodipine Besylate | 244 | 51 |
| Lisinopril | 169 | 41 |
| Empagliflozinbrand: Jardiance | 114 | 27 |
| Losartan Potassium | 105 | 21 |
| Dulaglutidebrand: Trulicity | 104 | 23 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-02-26
- Last updated
- 2019-05-08
Frequently asked questions
- What is Karen Lasser's NPI number?
- Karen Lasser's National Provider Identifier (NPI) is 1932235520, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Lasser's specialty?
- Karen Lasser is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Lasser located?
- Karen Lasser's practice location on file with NPPES is 801 Massachusetts Ave, Boston, MA 02118-2605.
- What is Karen Lasser's phone number?
- The practice phone number listed in the NPPES registry for Karen Lasser is (617) 414-5951.
- Does Karen Lasser accept Medicare?
- Karen Lasser is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Lasser's NPI active?
- Yes — Karen Lasser's NPI (1932235520) is active in the NPPES registry as of the last update on 2019-05-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.