Christine Chang, MD
NPI 1336602119 · Hospitalist Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Christine Chang, MD is a Hospitalist Physician provider in Oakland, CA (NPI 1336602119).
Provider details
- NPI number
- 1336602119
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A179940 (CA)
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 tenure28% of score
7 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
795 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 485 | $131 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 135 | $130 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 79 | $87 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 75 | $192 |
| Advance Care Planning, First 30 Minutes99497 | 21 | $85 |
Typical Medicare-allowed amounts for these services range $85–$192 (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 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 21 | 21 |
| Oxycodone Hcl | 18 | 16 |
| Prednisone | 18 | 18 |
| Atorvastatin Calcium | 16 | 15 |
| Pantoprazole Sodium | 14 | 14 |
| Albuterol Sulfatebrand: Albuterol Sulfate Hfa | 12 | 12 |
Practice location
Mailing address
Additional practice locations (1)
- 1101 Van Ness AveSan Francisco, CA 94109-6919Phone: (415) 600-6000Fax: (415) 600-6000
Registry dates
- Enumerated
- 2019-04-09
- Last updated
- 2025-01-14
- Certified
- 2025-01-14
Frequently asked questions
- What is Christine Chang's NPI number?
- Christine Chang's National Provider Identifier (NPI) is 1336602119, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Christine Chang's specialty?
- Christine Chang is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Christine Chang located?
- Christine Chang's practice location on file with NPPES is 350 Hawthorne Ave, Oakland, CA 94609-3108.
- What is Christine Chang's phone number?
- The practice phone number listed in the NPPES registry for Christine Chang is (510) 869-6883.
- Does Christine Chang accept Medicare?
- Christine Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Christine Chang's NPI active?
- Yes — Christine Chang's NPI (1336602119) is active in the NPPES registry as of the last update on 2025-01-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.