Charissa Chang, MD
NPI 1649299686 · Gastroenterology Physician · New York, NY
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charissa Chang, MD is a Gastroenterology Physician provider in New York, NY (NPI 1649299686).
Provider details
- NPI number
- 1649299686
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- 236171 (NY)
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
19 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
327 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 152 | $101 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 64 | $86 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 45 | $9 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 23 | $63 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 22 | $141 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 41 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tacrolimus | 515 | 65 |
| Tenofovir Alafenamidebrand: Vemlidy | 260 | 37 |
| Ursodiol | 210 | 46 |
| Entecavir | 133 | 23 |
| Mycophenolate Mofetil | 95 | 14 |
| Pantoprazole Sodium | 93 | 20 |
| Amlodipine Besylate | 90 | 16 |
| Omeprazole |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-19
- Last updated
- 2019-09-27
Frequently asked questions
- What is Charissa Chang's NPI number?
- Charissa Chang's National Provider Identifier (NPI) is 1649299686, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charissa Chang's specialty?
- Charissa Chang is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Charissa Chang located?
- Charissa Chang's practice location on file with NPPES is 5 East 98th Street, New York, NY 10029.
- What is Charissa Chang's phone number?
- The practice phone number listed in the NPPES registry for Charissa Chang is (212) 241-0034.
- Does Charissa Chang accept Medicare?
- Charissa Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charissa Chang's NPI active?
- Yes — Charissa Chang's NPI (1649299686) is active in the NPPES registry as of the last update on 2019-09-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.