Charles Chang, MD
NPI 1942436886 · Urology Physician · Concord, CA
Enrolled with Medicare as Practitioner - Urology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charles Chang, MD is a Urology Physician provider in Concord, CA (NPI 1942436886).
Provider details
- NPI number
- 1942436886
- Entity type
- Individual
- Primary specialty
- Urology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- C166684 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
17 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
40 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 | 15 | $109 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 13 | $74 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 12 | $146 |
Typical Medicare-allowed amounts for these services range $74–$146 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tamsulosin Hcl | 383 | 131 |
| Oxybutynin Chloridebrand: Oxybutynin Chloride Er | 118 | 37 |
| Mirabegronbrand: Myrbetriq | 109 | 37 |
| Alfuzosin Hclbrand: Alfuzosin Hcl Er | 107 | 31 |
| Finasteride | 81 | 28 |
| Leuprolide Acetatebrand: Lupron Depot | 53 | 17 |
| Solifenacin Succinate |
Practice location
Mailing address
Additional practice locations (2)
- 199 Mount Eden PkwyBronx, NY 10457-7703Phone: (718) 992-7669
- 3124 S 19th St # 320Tacoma, WA 98405-2433Phone: (253) 301-5100
Registry dates
- Enumerated
- 2009-06-05
- Last updated
- 2024-12-12
- Certified
- 2024-12-12
Frequently asked questions
- What is Charles Chang's NPI number?
- Charles Chang's National Provider Identifier (NPI) is 1942436886, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Chang's specialty?
- Charles Chang is listed in the NPPES registry with a primary specialty of Urology Physician (Allopathic & Osteopathic Physicians).
- Where is Charles Chang located?
- Charles Chang's practice location on file with NPPES is 2222 East St Ste 250, Concord, CA 94520-2096.
- What is Charles Chang's phone number?
- The practice phone number listed in the NPPES registry for Charles Chang is (925) 609-7220.
- Does Charles Chang accept Medicare?
- Charles Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charles Chang's NPI active?
- Yes — Charles Chang's NPI (1942436886) is active in the NPPES registry as of the last update on 2024-12-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.