Hau Nguyen, MD
NPI 1578140646 · Internal Medicine Physician · Worcester, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Hau Nguyen, MD is a Internal Medicine Physician provider in Worcester, MA (NPI 1578140646).
Provider details
- NPI number
- 1578140646
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 1018677 (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
5 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
104 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) |
|---|---|---|
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 86 | $171 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 18 | $130 |
Typical Medicare-allowed amounts for these services range $130–$171 (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.
Practice location
Mailing address
Additional practice locations (1)
- 55 Lake Ave NWorcester, MA 01655-0002Phone: (508) 334-8515Fax: (508) 334-6490
Registry dates
- Enumerated
- 2021-03-25
- Last updated
- 2024-07-12
- Certified
- 2024-07-12
Frequently asked questions
- What is Hau Nguyen's NPI number?
- Hau Nguyen's National Provider Identifier (NPI) is 1578140646, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Hau Nguyen's specialty?
- Hau Nguyen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Hau Nguyen located?
- Hau Nguyen's practice location on file with NPPES is 119 Belmont St, Worcester, MA 01605-2903.
- What is Hau Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Hau Nguyen is (508) 334-8515.
- Does Hau Nguyen accept Medicare?
- Hau Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Hau Nguyen's NPI active?
- Yes — Hau Nguyen's NPI (1578140646) is active in the NPPES registry as of the last update on 2024-07-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.