Hanna Chao, M.D.
NPI 1376581991 · Internal Medicine Physician · Chelsea, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Hanna Chao, M.D. is a Internal Medicine Physician provider in Chelsea, MA (NPI 1376581991).
Provider details
- NPI number
- 1376581991
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 045508 (CT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
57 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 | 35 | $122 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 22 | $164 |
Typical Medicare-allowed amounts for these services range $122–$164 (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 · 28 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 97 | 36 |
| Metoprolol Succinate | 62 | 15 |
| Metformin Hcl | 59 | 20 |
| Omeprazole | 49 | 15 |
| Lisinopril | 41 | 16 |
| Amlodipine Besylate | 31 | 13 |
| Losartan Potassium |
Practice location
Mailing address
Additional practice locations (2)
- 55 Lock StNew Haven, CT 06511-3603Phone: (203) 432-0123
- 4a Devine StNorth Haven, CT 06473-2142Phone: (203) 287-6900
Registry dates
- Enumerated
- 2006-06-04
- Last updated
- 2024-02-16
- Certified
- 2024-02-16
Frequently asked questions
- What is Hanna Chao's NPI number?
- Hanna Chao's National Provider Identifier (NPI) is 1376581991, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Hanna Chao's specialty?
- Hanna Chao is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Hanna Chao located?
- Hanna Chao's practice location on file with NPPES is 151 Everett Ave, Chelsea, MA 02150-1807.
- What is Hanna Chao's phone number?
- The practice phone number listed in the NPPES registry for Hanna Chao is (617) 889-8580.
- Does Hanna Chao accept Medicare?
- Hanna Chao is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Hanna Chao's NPI active?
- Yes — Hanna Chao's NPI (1376581991) is active in the NPPES registry as of the last update on 2024-02-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.