Allen Hwang, M.D., M.S.C.E.
NPI 1558532689 · Gastroenterology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Allen Hwang, M.D., M.S.C.E. is a Gastroenterology Physician provider in Boston, MA (NPI 1558532689).
Provider details
- NPI number
- 1558532689
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., M.S.C.E.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A103081 (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 tenure25% of score
18 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
1,356 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 275 | $128 |
| 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 | 187 | $17 |
| Therapy Procedure to Re-Educate Brain-To-Nerve-To-Muscle Function, Each 15 Minutes97112 | 113 | $33 |
| Therapy Procedure Using Manual Technique, Each 15 Minutes97140 | 98 | $22 |
| Therapy Procedure Using Exercise to Develop Strength, Endurance, Range of Motion, and Flexibility, Each 15 Minutes97110 | 97 | $24 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 18 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 112 | 38 |
| Sod Sulf/Pot Chloride/Mag Sulfbrand: Sutab | 79 | 73 |
| Lipase/Protease/Amylasebrand: Creon | 42 | — |
| Pantoprazole Sodium | 40 | 14 |
| Sucralfate | 37 | 17 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 36 | 35 |
| Linaclotidebrand: Linzess |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,027 across 47 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
- 2008-03-17
- Last updated
- 2014-11-20
Frequently asked questions
- What is Allen Hwang's NPI number?
- Allen Hwang's National Provider Identifier (NPI) is 1558532689, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Allen Hwang's specialty?
- Allen Hwang is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Allen Hwang located?
- Allen Hwang's practice location on file with NPPES is 800 Washington St, Boston, MA 02111-1552.
- What is Allen Hwang's phone number?
- The practice phone number listed in the NPPES registry for Allen Hwang is (617) 636-1273.
- Does Allen Hwang accept Medicare?
- Allen Hwang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Allen Hwang's NPI active?
- Yes — Allen Hwang's NPI (1558532689) is active in the NPPES registry as of the last update on 2014-11-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.