Kuo Ooi, M.D.
NPI 1598775421 · Internal Medicine Physician · Rocklin, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kuo Ooi, M.D. is a Internal Medicine Physician provider in Rocklin, CA (NPI 1598775421).
Provider details
- NPI number
- 1598775421
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A96680 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Other Service Providers
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 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
709 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 153 | $135 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 133 | $96 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 102 | $137 |
| Aspiration And/Or Injection of Fluid Large Joint Using Ultrasound Guidance20611 | 59 | $93 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 57 | $15 |
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 92 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 347 | 93 |
| Amlodipine Besylate | 189 | 50 |
| Losartan Potassium | 168 | 44 |
| Levothyroxine Sodium | 142 | 37 |
| Rosuvastatin Calcium | 103 | 37 |
| Lisinopril | 89 | 26 |
| Fenofibrate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,334 across 130 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
- 2006-08-09
- Last updated
- 2023-03-07
Frequently asked questions
- What is Kuo Ooi's NPI number?
- Kuo Ooi's National Provider Identifier (NPI) is 1598775421, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kuo Ooi's specialty?
- Kuo Ooi is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Kuo Ooi located?
- Kuo Ooi's practice location on file with NPPES is 3104 Sunset Blvd Ste 2b, Rocklin, CA 95677-3093.
- What is Kuo Ooi's phone number?
- The practice phone number listed in the NPPES registry for Kuo Ooi is (916) 624-0300.
- Does Kuo Ooi accept Medicare?
- Kuo Ooi is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kuo Ooi's NPI active?
- Yes — Kuo Ooi's NPI (1598775421) is active in the NPPES registry as of the last update on 2023-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.