Timothy Larsen, D.O.
NPI 1477845337 · Clinical Cardiac Electrophysiology Physician · Chicago, IL
Enrolled with Medicare as Practitioner - Cardiac Electrophysiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Timothy Larsen, D.O. is a Clinical Cardiac Electrophysiology Physician provider in Chicago, IL (NPI 1477845337).
Provider details
- NPI number
- 1477845337
- Entity type
- Individual
- Primary specialty
- Clinical Cardiac Electrophysiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 036-149085 (IL)
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 tenure25% of score
15 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
4,310 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 1,769 | $8 |
| Evaluation of Single, Dual, Or Multiple Lead Implantable Defibrillator System, Remote Up to 90 Days93295 | 356 | $37 |
| Evaluation of Cardiac Rhythm Monitor System, Remote Up to 30 Days93298 | 317 | $25 |
| Heart Rhythm Review and Interpretation of Continous External Ekg Over 8-15 Days93248 | 291 | $25 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 258 | $99 |
| Programming of Dual Lead Pacemaker System93280 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 21 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 642 | 202 |
| Metoprolol Succinate | 404 | 155 |
| Amiodarone Hcl | 220 | 87 |
| Rivaroxabanbrand: Xarelto | 216 | 74 |
| Dofetilide | 110 | 31 |
| Metoprolol Tartrate | 81 | 28 |
| Carvedilol | 78 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$8,040 across 116 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-05-11
- Last updated
- 2019-07-23
Frequently asked questions
- What is Timothy Larsen's NPI number?
- Timothy Larsen's National Provider Identifier (NPI) is 1477845337, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Timothy Larsen's specialty?
- Timothy Larsen is listed in the NPPES registry with a primary specialty of Clinical Cardiac Electrophysiology Physician (Allopathic & Osteopathic Physicians).
- Where is Timothy Larsen located?
- Timothy Larsen's practice location on file with NPPES is 1725 W Harrison St Ste 1159, Chicago, IL 60612.
- What is Timothy Larsen's phone number?
- The practice phone number listed in the NPPES registry for Timothy Larsen is (312) 942-5020.
- Does Timothy Larsen accept Medicare?
- Timothy Larsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Timothy Larsen's NPI active?
- Yes — Timothy Larsen's NPI (1477845337) is active in the NPPES registry as of the last update on 2019-07-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.