Nelson Chuang, M.D., M.H.S.
NPI 1336427004 · Gastroenterology Physician · Frederick, MD
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nelson Chuang, M.D., M.H.S. is a Gastroenterology Physician provider in Frederick, MD (NPI 1336427004).
Provider details
- NPI number
- 1336427004
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., M.H.S.
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
14 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
835 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 | 274 | $126 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 168 | $89 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 106 | $244 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 86 | $161 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 66 | $51 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 79 | 31 |
| Pantoprazole Sodium | 64 | 24 |
| Esomeprazole Magnesium | 39 | 14 |
| Famotidine | 37 | 19 |
| Obeticholic Acidbrand: Ocaliva | 13 | — |
| Rabeprazole Sodium | 13 | — |
| Mesalamine | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,203 across 111 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
Additional practice locations (1)
- 111 E 210th StBronx, NY 10467-2401Phone: (718) 920-4321
Registry dates
- Enumerated
- 2011-07-29
- Last updated
- 2023-11-07
- Certified
- 2023-11-07
Frequently asked questions
- What is Nelson Chuang's NPI number?
- Nelson Chuang's National Provider Identifier (NPI) is 1336427004, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nelson Chuang's specialty?
- Nelson Chuang is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Nelson Chuang located?
- Nelson Chuang's practice location on file with NPPES is 7109 Guilford Dr Ste 300, Frederick, MD 21704-5179.
- What is Nelson Chuang's phone number?
- The practice phone number listed in the NPPES registry for Nelson Chuang is (301) 695-6800.
- Does Nelson Chuang accept Medicare?
- Nelson Chuang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nelson Chuang's NPI active?
- Yes — Nelson Chuang's NPI (1336427004) is active in the NPPES registry as of the last update on 2023-11-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.