Quick answers
- Does Trixie Lorraine C. Pei accept Medicare assignment?
- Yes. Medicare's clinician data says Trixie Lorraine C. Pei accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Trixie Lorraine C. Pei see?
- In 2024, CMS data shows 460 Original Medicare patients and 1,534 services for Trixie Lorraine C. Pei. This counts Original Medicare only and measures volume, not quality.
- What is Trixie Lorraine C. Pei's NPI number?
- 1538664669. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Trixie Lorraine C. Pei, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 460 |
|---|---|
| Services billed to Medicare | 1,534 |
| Different services or procedures | 21 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)550 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)398 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)153 services
- Dialysis services, 1 physician visit per month (20 years or older) (90962)120 services
- Dialysis services, 2-3 physician visits per month (20 years or older) (90961)97 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Chronic kidney disease75%
- Diabetes52%
- Heart failure50%
- Ischemic heart disease48%
Hospitals where Trixie Lorraine C. Pei works
Medicare's Facility Affiliation Data lists Trixie Lorraine C. Pei at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Adventist Health ClearlakeClearlake, CA · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 051317
- Adventist Health St HelenaSaint Helena, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050013
- Adventist Health Ukiah ValleyUkiah, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050301
- Providence Queen of the Valley Medical CenterNapa, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050009
- Sonoma Valley HospitalSonoma, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050090
Practice locations
Addresses where Trixie Lorraine C. Pei is enrolled with Medicare (CMS data updated October 2, 2026).
- 15130 Lakeshore DrClearlake, CA 95422 (707) 253‑7005
- 244 Peckham CtLakeport, CA 95453 (707) 253‑7005
- 3230 Beard RdNapa, CA 94558 (707) 253‑7005
- 3230 Beard Rd, Suite 1Napa, CA 94558
- 480 Redwood St, Suite 14Vallejo, CA 94590 (707) 253‑7005
Group practices
Medicare enrollment lists Trixie Lorraine C. Pei as a member of this group (CMS data updated October 2, 2026).
- Nagarathna G Manjappa M D Inc4 clinicians in the group
Specialties
- Nephrologyprimary
Other nephrologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Other clinicians in Nagarathna G Manjappa M D Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2013 (13 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1538664669 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians