Choon Koo, M.D.
NPI 1265427595 · Anatomic Pathology & Clinical Pathology Physician · Upland, CA
Enrolled with Medicare as Practitioner - Pathology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Choon Koo, M.D. is a Anatomic Pathology & Clinical Pathology Physician provider in Upland, CA (NPI 1265427595).
Provider details
- NPI number
- 1265427595
- Entity type
- Individual
- Primary specialty
- Anatomic Pathology & Clinical Pathology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A31561 (CA)
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
20 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
1,469 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) |
|---|---|---|
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 515 | $36 |
| Special Stained Specimen Slides to Examine Tissue, Each Additional Procedure88341 | 203 | $26 |
| Special Stained Specimen Slides to Examine Tissue Including Interpretation and Report88313 | 134 | $12 |
| Special Stained Specimen Slides to Examine Tissue, Initial Procedure88342 | 131 | $34 |
| Pathology Examination of Tissue Using a Microscope, Moderately High Complexity88307 | 95 | $80 |
| Pathology Examination of Tissue Using a Microscope, Moderately Low Complexity88304 | 73 | $11 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-09-13
- Last updated
- 2007-07-08
Frequently asked questions
- What is Choon Koo's NPI number?
- Choon Koo's National Provider Identifier (NPI) is 1265427595, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Choon Koo's specialty?
- Choon Koo is listed in the NPPES registry with a primary specialty of Anatomic Pathology & Clinical Pathology Physician (Allopathic & Osteopathic Physicians).
- Where is Choon Koo located?
- Choon Koo's practice location on file with NPPES is 999 San Bernardino Rd, Upland, CA 91786-4920.
- What is Choon Koo's phone number?
- The practice phone number listed in the NPPES registry for Choon Koo is (909) 985-2811.
- Does Choon Koo accept Medicare?
- Choon Koo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Choon Koo's NPI active?
- Yes — Choon Koo's NPI (1265427595) 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.