Charlie Chang, M.D.
NPI 1417996109 · Endocrinology, Diabetes & Metabolism Physician · Webster, TX
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charlie Chang, M.D. is a Endocrinology, Diabetes & Metabolism Physician provider in Webster, TX (NPI 1417996109).
Provider details
- NPI number
- 1417996109
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- L6318 (TX)
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
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
8 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,935 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 | 1,080 | $126 |
| 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 | 298 | $16 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 151 | $89 |
| Administration of Non-Hormonal Anti-Neoplastic Chemotherapy Under Skin Or Into Muscle96401 | 107 | $71 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 91 | $117 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 128 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Semaglutidebrand: Ozempic | 899 | 222 |
| Levothyroxine Sodium | 790 | 267 |
| Metformin Hcl | 469 | 165 |
| Levothyroxine Sodiumbrand: Synthroid | 449 | 130 |
| Metformin Hclbrand: Metformin Hcl Er | 407 | 145 |
| Empagliflozinbrand: Jardiance | 364 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,437 across 121 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 (7)
- 9645 Barker Cypress Rd Ste 100Cypress, TX 77433-5292Phone: (346) 250-6010
- 9645 Barker Cypress Rd Ste 102Cypress, TX 77433-5292Phone: (346) 738-1650Fax: (346) 207-0083
- 4615 Southwest Fwy Ste 900Houston, TX 77027-7191Phone: (346) 613-1423
- 14100 Southwest Fwy Ste 500Sugar Land, TX 77478-3483Phone: (346) 466-0032Fax: (346) 200-3086
- 500 N Kobayashi Ste CWebster, TX 77598-4722Phone: (281) 816-3092Fax: (281) 336-9318
- 600 N Kobayashi Ste 110Webster, TX 77598-4841Phone: (281) 338-1701Fax: (281) 724-1857
- 600 N Kobayashi Ste 309Webster, TX 77598-4841Phone: (281) 724-8332Fax: (832) 905-5977
Registry dates
- Enumerated
- 2006-06-06
- Last updated
- 2026-03-17
- Certified
- 2026-03-17
Frequently asked questions
- What is Charlie Chang's NPI number?
- Charlie Chang's National Provider Identifier (NPI) is 1417996109, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charlie Chang's specialty?
- Charlie Chang is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Charlie Chang located?
- Charlie Chang's practice location on file with NPPES is 600 N Kobayashi Ste 312, Webster, TX 77598-4841.
- What is Charlie Chang's phone number?
- The practice phone number listed in the NPPES registry for Charlie Chang is (281) 724-8333.
- Does Charlie Chang accept Medicare?
- Charlie Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charlie Chang's NPI active?
- Yes — Charlie Chang's NPI (1417996109) is active in the NPPES registry as of the last update on 2026-03-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.