John Judson Trix , MS, RN, APRN-BC
Nurse Practitioner โข Walnut Creek, CA
122 La Casa Via Ste 120
Walnut Creek, CA 945983019
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on August 11, 2007; this date does not establish years in practice.
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Published CMS data list 1,021 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 36415 โ Insertion of needle into vein for collection of blood sample: 379 service units.
- 99205 โ New patient outpatient office visit: 268 service units.
- 93005 โ Routine electrocardiogram (ecg) using at least 12 leads with tracing: 220 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPTยฎ only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 5 records in the table ยท Guide: How to read Medicare Part B data
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More Medicare Part B services than 90% of clinicians listed under Nurse Practitioner in Walnut Creek, CA (2024, 24 clinicians with data). Median for this group: 540. Middle half: 261 to 824.
More Medicare Part B services than 85% of clinicians listed under Nurse Practitioner in California (2024, 2,070 clinicians with data). Median for this group: 203. Middle half: 74 to 543.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 174 in 2022 to 1,021 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2022โ2024.
Practice Location & Contact Primary Location
122 La Casa Via Ste 120
Walnut Creek, CA 945983019
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 1 additional practice-address record in Larkspur, CA. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 1 group name: John Muir Physician Network. See the list
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026
University Of Michigan Medical School
2007
What Public CMS Data Show
Nurse Practitioner: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
415 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider, 2024.
Medicare-allowed amount
About $90,968 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
Paid by Medicare
About $71,905 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2021โ2025.
Years since graduation
19 years (graduated 2007)
CMS Doctors and Clinicians data list 2007 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.
NPI first issued
2007
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians, CMS release of October 2, 2026; Medicare.gov, โDoes your provider accept Medicare as full payment?โ
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.
Enrolled in Medicare (PECOS)
John Trix has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists John Trix as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Walnut Creek and California
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 90% of clinicians listed under Nurse Practitioner in Walnut Creek, CA (2024, 24 clinicians with data). Median for this group: 540. Middle half: 261 to 824.
More Medicare Part B services than 85% of clinicians listed under Nurse Practitioner in California (2024, 2,070 clinicians with data). Median for this group: 203. Middle half: 74 to 543.
Medicare-allowed amount
A higher Medicare-allowed amount than 90% of clinicians listed under Nurse Practitioner in Walnut Creek, CA (2024, 24 clinicians with data). Median for this group: $55,091. Middle half: $31,825 to $78,911.
A higher Medicare-allowed amount than 85% of clinicians listed under Nurse Practitioner in California (2024, 2,070 clinicians with data). Median for this group: $18,742. Middle half: $6,881 to $46,917.
Paid by Medicare
A higher Medicare payment amount than 95% of clinicians listed under Nurse Practitioner in Walnut Creek, CA (2024, 24 clinicians with data). Median for this group: $40,709. Middle half: $24,562 to $60,291.
A higher Medicare payment amount than 85% of clinicians listed under Nurse Practitioner in California (2024, 2,070 clinicians with data). Median for this group: $13,785. Middle half: $5,000 to $35,024.
72 active clinicians are listed under Nurse Practitioner with a practice address in Walnut Creek, CA (8,363 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Walnut Creek
26.4% of these 72 clinicians have the CMS telehealth indicator.
38.9% of these 72 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services increased 487% from 174 in 2022 to 1,021 in 2024.
- 2022: 174
- 2023: 812
- 2024: 1,021
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Medicare-allowed amount
Medicare-allowed amount increased 543% from $14,148 in 2022 to $90,968 in 2024.
- 2022: $14,148
- 2023: $69,411
- 2024: $90,968
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Paid by Medicare
Paid by Medicare increased 536% from $11,307 in 2022 to $71,905 in 2024.
- 2022: $11,307
- 2023: $55,078
- 2024: $71,905
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท Report an error.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2021โ2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ by Provider and Service data, 2022โ2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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36415
Insertion of needle into vein for collection of blood sample
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379 | 368 | $16.00 | $8.65 |
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99205
New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more
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268 | 268 | $589.00 | $220.81 |
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93005
Routine electrocardiogram (ecg) using at least 12 leads with tracing
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220 | 219 | $76.00 | $8.52 |
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99215
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
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125 | 122 | $421.00 | $182.77 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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29 | 27 | $316.00 | $130.77 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2022-08-02NUCC Taxonomy Code: 363L00000X
(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - NURSE PRACTITIONER
I20140925002117
CA
9335369388
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026
John Muir Physician Network
122 La Casa Via, Walnut Creek, CA 945983019
Phone: 9259414058
Secondary Practice Locations
2100 Lincoln Village Cir, Apt 2208
Larkspur, CA 949391613
Phone: 4157308464
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Nurse Practitioner
Nurse Practitioner
Nurse Practitioner - Adult Health
Nurse Practitioner
Physician Assistant
Physician Assistant (Certified)
Physician Assistant
Physician Assistant (Certified)
Nurse Practitioner - Family
Nurse Practitioner
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Registered at 122 LA CASA VIA STE 120, WALNUT CREEK, CA 945983019 (Tel: 9259414058)
Registered at 1450 TREAT BLVD STE 300, WALNUT CREEK, CA 945972168 (Tel: 9259522828)
Additional practice office at 2100 Lincoln Village Cir, Apt 2208, Larkspur, CA 949391613
Nurse Practitioner (license number reported to NPPES: CA 17156)
NPI status registered as active in NPPES database
Registered at 2100 LINCOLN VILLAGE CIR, APT 2208, LARKSPUR, CA 949391613 (Tel: 4157308464)
Registered at 2100 LINCOLN VILLAGE CIR, APT 2208, LARKSPUR, CA 949391613 (Tel: 4157308464)
Recorded as JOHN TRIX, MS, RN, APRN-BC
Nurse Practitioner (license number reported to NPPES: CA 17156)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Nurse Practitioners in Walnut Creek
- Adam Fuller, NP
- Maki Matsumura, NP-C
- Jared Domaguing
- Emily Leonard, NP
- Stephanie Chan, FNP-BC
- Haesook Kim, NP
Mailing Address
1450 Treat Blvd Ste 300
Walnut Creek, CA 945972168
Phone: 9259522828