Catherine Ngo, M.D.
NPI 1558531129 · Gastroenterology Physician · Laguna Hills, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Catherine Ngo, M.D. is a Gastroenterology Physician provider in Laguna Hills, CA (NPI 1558531129).
Provider details
- NPI number
- 1558531129
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A103043 (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
18 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
497 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) |
|---|---|---|
| Study of Esophagus to Assess Movement91010 | 57 | $67 |
| Study of Esophagus to Assess Movement With Stimulation Or Tube91013 | 57 | $9 |
| Monitoring and Recording of Esophageal Function Through Nasal Tube With Electrode91037 | 57 | $50 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 53 | $236 |
| Test for Tone and Sensation of Rectum and Anus91120 | 50 | $50 |
| Study of Rectum Sensitivity and Function91122 | 50 | $90 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 37 | 12 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 20 | 20 |
| Colestipol Hcl | 18 | — |
| Lactulose | 15 | 13 |
| Tenofovir Alafenamidebrand: Vemlidy | 12 | — |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$720 across 20 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
- 2008-03-10
- Last updated
- 2012-10-08
Frequently asked questions
- What is Catherine Ngo's NPI number?
- Catherine Ngo's National Provider Identifier (NPI) is 1558531129, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Catherine Ngo's specialty?
- Catherine Ngo is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Catherine Ngo located?
- Catherine Ngo's practice location on file with NPPES is 24221 Calle De La Louisa, Laguna Hills, CA 92653-7638.
- What is Catherine Ngo's phone number?
- The practice phone number listed in the NPPES registry for Catherine Ngo is (949) 770-7163.
- Does Catherine Ngo accept Medicare?
- Catherine Ngo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Catherine Ngo's NPI active?
- Yes — Catherine Ngo's NPI (1558531129) is active in the NPPES registry as of the last update on 2012-10-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.