Karen Blumenthal, MD
NPI 1922362482 · Internal Medicine Physician · Boston, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Blumenthal, MD is a Internal Medicine Physician provider in Boston, MA (NPI 1922362482).
Provider details
- NPI number
- 1922362482
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- L-251289 (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
13 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
347 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 | 80 | $138 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 75 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 47 | $102 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 39 | $141 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 37 | $17 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 101 | 41 |
| Rosuvastatin Calcium | 38 | 16 |
| Omeprazole | 38 | 16 |
| Lisinopril | 37 | 12 |
| Amlodipine Besylate | 36 | 14 |
| Levothyroxine Sodium | 32 | 12 |
| Metoprolol Succinate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-06-29
- Last updated
- 2012-06-29
Frequently asked questions
- What is Karen Blumenthal's NPI number?
- Karen Blumenthal's National Provider Identifier (NPI) is 1922362482, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Blumenthal's specialty?
- Karen Blumenthal is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Blumenthal located?
- Karen Blumenthal's practice location on file with NPPES is Massachusetts General Hospital, Boston, MA 02114.
- What is Karen Blumenthal's phone number?
- The practice phone number listed in the NPPES registry for Karen Blumenthal is (617) 726-2865.
- Does Karen Blumenthal accept Medicare?
- Karen Blumenthal is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Blumenthal's NPI active?
- Yes — Karen Blumenthal's NPI (1922362482) is active in the NPPES registry as of the last update on 2012-06-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.