Justin Chau, M.D.
NPI 1871974154 · Hematology & Oncology Physician · Grafton, WI
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Justin Chau, M.D. is a Hematology & Oncology Physician provider in Grafton, WI (NPI 1871974154).
Provider details
- NPI number
- 1871974154
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD-45076 (IA)
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
11 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
787 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) |
|---|---|---|
| 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 | 344 | $15 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 178 | $89 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 105 | $130 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 64 | $165 |
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 42 | $90 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 92 | 23 |
| Abiraterone Acetate | 52 | — |
| Anastrozole | 41 | — |
| Hydroxyurea | 41 | — |
| Apixabanbrand: Eliquis | 31 | 11 |
| Pantoprazole Sodium | 23 | — |
| Acyclovir | 21 | — |
Practice location
Mailing address
Additional practice locations (1)
- 200 Hawkins DrIowa City, IA 52242-1009Phone: (319) 356-2148Fax: (319) 353-8383
Registry dates
- Enumerated
- 2015-06-12
- Last updated
- 2026-05-05
- Certified
- 2026-05-05
Frequently asked questions
- What is Justin Chau's NPI number?
- Justin Chau's National Provider Identifier (NPI) is 1871974154, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Justin Chau's specialty?
- Justin Chau is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Justin Chau located?
- Justin Chau's practice location on file with NPPES is 975 Port Washington Rd, Grafton, WI 53024-9204.
- Does Justin Chau accept Medicare?
- Justin Chau is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Justin Chau's NPI active?
- Yes — Justin Chau's NPI (1871974154) is active in the NPPES registry as of the last update on 2026-05-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.