Aili Guo, MD
NPI 1598822645ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Sacramento, CA
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) with Regents of the Univ of Ca and 1 other group, practicing in Sacramento, California. Their prescriptions cost Medicare Part D more than their services did: $599,224 for 1,164 claims, against $96,183 paid for services in 2024. Amgen Inc. reported $174.26 in payments in 2025, mostly food and beverage. Lists University of California Davis Medical Center as a hospital affiliation.
Overview
| NPI | 1598822645 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jan 1, 2007 |
| Last updated in NPPES | Mar 24, 2020 |
| Certified by provider | Mar 24, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | A130171 | CA |
| Internal Medicine | 207R00000X | 60492241205 | UT |
| Internal Medicine, Endocrinology, Diabetes & Metabolism | 207RE0101X | 35.095592 | OH |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Endocrinology (CA); Practitioner - Endocrinology (OH) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 300 |
|---|---|
| Services billed | 2,980 across 25 procedure codes |
| Paid by Medicare | $96,183 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,164 · 2,515 30-day fills |
|---|---|
| Patients | 169 |
| Total drug cost | $599,224 |
| Generic share | 39% of claims |
Education and affiliations
| Graduation year | 1983 |
|---|---|
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical groups
- Regents of the Univ of CaSacramento, CA · 1,584 clinicians
- Regents of the University of CaliforniaSacramento, CA · 567 clinicians
Hospital affiliation
- University of California Davis Medical CenterSacramento, CA
Industry payments (Open Payments)
- 2025$174.26 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $174.26 | 2 |
What the 2025 payments were for
- Food and Beverage$174.26 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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