Patrick Koo, MD
NPI 1801152772 · Gastroenterology Physician · Fullerton, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Patrick Koo, MD is a Gastroenterology Physician provider in Fullerton, CA (NPI 1801152772).
Provider details
- NPI number
- 1801152772
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A136521 (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
14 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
1,306 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) |
|---|---|---|
| Moderate Sedation Services Provided By the Same Physician Or Other Qualified Health Care Professional Performing a Gastrointestinal Endoscopic Service That Sedation Supports, Requiring the Presence of an Independent Trained Observer to Assist in the MonitoG0500 | 174 | $6 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 155 | $138 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 139 | $86 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 123 | $220 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 103 | $122 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 25 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 457 | 199 |
| Colestipol Hcl | 68 | 35 |
| Omeprazole | 49 | 24 |
| Famotidine | 47 | 21 |
| Linaclotidebrand: Linzess | 42 | 19 |
| Dicyclomine Hcl | 36 | 19 |
| Lactulose | 31 | 19 |
| Prucalopride Succinate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,684 across 101 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
- 2012-04-05
- Last updated
- 2024-10-22
- Certified
- 2024-10-22
Frequently asked questions
- What is Patrick Koo's NPI number?
- Patrick Koo's National Provider Identifier (NPI) is 1801152772, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Patrick Koo's specialty?
- Patrick Koo is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Patrick Koo located?
- Patrick Koo's practice location on file with NPPES is 1837 Sunny Crest Dr, Fullerton, CA 92835-3616.
- What is Patrick Koo's phone number?
- The practice phone number listed in the NPPES registry for Patrick Koo is (714) 446-5831.
- Does Patrick Koo accept Medicare?
- Patrick Koo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Patrick Koo's NPI active?
- Yes — Patrick Koo's NPI (1801152772) is active in the NPPES registry as of the last update on 2024-10-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.