Young Chang, MD
NPI 1639218290 · Internal Medicine Physician · Tamuning, GU
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Young Chang, MD is a Internal Medicine Physician provider in Tamuning, GU (NPI 1639218290).
Provider details
- NPI number
- 1639218290
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- M1121 (GU)
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
2,010 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 1,402 | $122 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 363 | $87 |
| Administration of Influenza Virus VaccineG0008 | 124 | $28 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 57 | $161 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 27 | $14 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 49 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 385 | 57 |
| Amlodipine Besylate | 273 | 38 |
| Nifedipinebrand: Nifedipine Er | 118 | 18 |
| Glipizide | 108 | 17 |
| Pantoprazole Sodium | 106 | 14 |
| Metoprolol Succinate | 82 | 14 |
| Hydrochlorothiazide | 78 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-02-06
- Last updated
- 2007-07-08
Frequently asked questions
- What is Young Chang's NPI number?
- Young Chang's National Provider Identifier (NPI) is 1639218290, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Young Chang's specialty?
- Young Chang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Young Chang located?
- Young Chang's practice location on file with NPPES is 416 Chalan San Antonio Rd, Tamuning, GU 96913-2635.
- What is Young Chang's phone number?
- The practice phone number listed in the NPPES registry for Young Chang is (671) 646-2984.
- Does Young Chang accept Medicare?
- Young Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Young Chang's NPI active?
- Yes — Young Chang's NPI (1639218290) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.