Karin Hjalmarson, MD
NPI 1811987225 · Internal Medicine Physician · Chestnut Hill, MA
Enrolled with Medicare as Practitioner - Infectious Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karin Hjalmarson, MD is a Internal Medicine Physician provider in Chestnut Hill, MA (NPI 1811987225).
Provider details
- NPI number
- 1811987225
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- 224129 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 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
1,080 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 | 400 | $140 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 201 | $141 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 190 | $99 |
| 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 | 121 | $17 |
| Administration of Influenza Virus VaccineG0008 | 57 | $35 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Tracing |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 77 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 469 | 145 |
| Amlodipine Besylate | 302 | 66 |
| Levothyroxine Sodium | 254 | 57 |
| Lisinopril | 224 | 67 |
| Hydrochlorothiazide | 160 | 36 |
| Metoprolol Succinate | 154 | 35 |
| Gabapentin |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-10-26
- Last updated
- 2015-11-10
Frequently asked questions
- What is Karin Hjalmarson's NPI number?
- Karin Hjalmarson's National Provider Identifier (NPI) is 1811987225, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karin Hjalmarson's specialty?
- Karin Hjalmarson is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karin Hjalmarson located?
- Karin Hjalmarson's practice location on file with NPPES is 822 Boylston St, Chestnut Hill, MA 02467-2595.
- What is Karin Hjalmarson's phone number?
- The practice phone number listed in the NPPES registry for Karin Hjalmarson is (617) 396-8866.
- Does Karin Hjalmarson accept Medicare?
- Karin Hjalmarson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karin Hjalmarson's NPI active?
- Yes — Karin Hjalmarson's NPI (1811987225) is active in the NPPES registry as of the last update on 2015-11-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.