Giancarlo Dimassa, MD
NPI 1255370797 · Emergency Medicine Physician · Pasadena, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Giancarlo Dimassa, MD is a Emergency Medicine Physician provider in Pasadena, CA (NPI 1255370797).
Provider details
- NPI number
- 1255370797
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A81063 (CA)
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
1,281 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) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report Only93010 | 130 | $9 |
| Emergency Department Visit With High Level of Medical Decision Making99285 | 120 | $185 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 84 | $139 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 80 | $8 |
| Automated Urinalysis Test81003 | 67 | $2 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Azithromycin | 47 | 47 |
| Cephalexin | 43 | 43 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 27 | 27 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 25 | 22 |
| Prednisone | 23 | 23 |
| Tirzepatidebrand: Mounjaro | 20 | — |
| Amoxicillin |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-06
- Last updated
- 2025-07-10
- Certified
- 2025-07-10
Frequently asked questions
- What is Giancarlo Dimassa's NPI number?
- Giancarlo Dimassa's National Provider Identifier (NPI) is 1255370797, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Giancarlo Dimassa's specialty?
- Giancarlo Dimassa is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Giancarlo Dimassa located?
- Giancarlo Dimassa's practice location on file with NPPES is 817 S Madison Ave, Pasadena, CA 91106-4404.
- What is Giancarlo Dimassa's phone number?
- The practice phone number listed in the NPPES registry for Giancarlo Dimassa is (310) 753-0885.
- Does Giancarlo Dimassa accept Medicare?
- Giancarlo Dimassa is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Giancarlo Dimassa's NPI active?
- Yes — Giancarlo Dimassa's NPI (1255370797) is active in the NPPES registry as of the last update on 2025-07-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.