Charles Chiang, M.D
NPI 1780889519 · Dermatology Physician · Fremont, CA
Enrolled with Medicare as Practitioner - Dermatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charles Chiang, M.D is a Dermatology Physician provider in Fremont, CA (NPI 1780889519).
Provider details
- NPI number
- 1780889519
- Entity type
- Individual
- Primary specialty
- Dermatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Male
- Sole proprietor
- No
- License
- A104751 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 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
1,593 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) |
|---|---|---|
| Destruction of Precancer Skin Growth, 2-14 Growths17003 | 613 | $9 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 293 | $153 |
| Destruction of Skin Growth, 1-14 Growths17110 | 241 | $141 |
| Destruction of Precancer Skin Growth, 1 Growth17000 | 129 | $47 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 94 | $198 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Mometasone Furoate | 77 | 51 |
| Hydrocortisone | 48 | 37 |
| Clobetasol Propionate | 45 | 29 |
| Mupirocin | 39 | 21 |
| Triamcinolone Acetonide | 33 | 23 |
| Ketoconazole | 29 | 15 |
| Dupilumabbrand: Dupixent Pen | 24 | — |
| Doxycycline Hyclate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,395 across 131 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
- 2007-06-20
- Last updated
- 2024-11-26
- Certified
- 2024-11-26
Frequently asked questions
- What is Charles Chiang's NPI number?
- Charles Chiang's National Provider Identifier (NPI) is 1780889519, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Chiang's specialty?
- Charles Chiang is listed in the NPPES registry with a primary specialty of Dermatology Physician (Allopathic & Osteopathic Physicians).
- Where is Charles Chiang located?
- Charles Chiang's practice location on file with NPPES is 1860 Mowry Ave Ste 304, Fremont, CA 94538-1730.
- What is Charles Chiang's phone number?
- The practice phone number listed in the NPPES registry for Charles Chiang is (510) 456-2390.
- Does Charles Chiang accept Medicare?
- Charles Chiang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charles Chiang's NPI active?
- Yes — Charles Chiang's NPI (1780889519) is active in the NPPES registry as of the last update on 2024-11-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.