John H. Fields, PA
- Medicare services, 2024
- 105
- Medicare patients, 2026
- 121
- Part D claims, 2026
- 172
- Hospital affiliations
- 2
- Industry payments
- $19
- Practice address
- 1000 Greenley Road, Sonora, CA 95370
- Practice phone
- Call (209) 536-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find John Fields' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
John H. Fields is a physician assistant in Sonora, California
John Fields practices at Adventist Health Sonora in Sonora, California, part of Adventist Health.
John Fields' NPI, 1730179433, was assigned on October 24, 2005. John Fields holds Texas license PA04509.
- NPI
- 1730179433NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9032141031
- NPI enumeration date
- October 24, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (209) 536-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
John H. Fields practices at Adventist Health Sonora in Sonora, California
John Fields' primary practice is Adventist Health Sonora, at 1000 Greenley Road, Sonora, CA 95370 in Tuolumne County. The practice phone is (209) 536-5000.
- Adventist Health Sonora1000 Greenley Road, Sonora, CA 95370 · Tuolumne CountyPhone(209) 536-5000
Source: Dmand AI Affiliation Data
John H. Fields is affiliated with 3 sites of care and 4 medical groups
John Fields' primary practice is Adventist Health Sonora in Sonora, California, part of Adventist Health. John Fields is also affiliated with Longview ContinueCARE Hospital. The medical group on file is Northeast Texas Emergency Physicians. Dmand AI also links John Fields to 3 more medical groups and 1 community health center, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at John H. Fields' practice
Dmand AI tracks the electronic health record (EHR) system at each site where John Fields practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Adventist Health Sonora | Available with a free account |
| +2 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Adventist Health and 6.2K+ hospitals, with verified contacts in the same login.
John H. Fields is one of 11,482 physician assistants in California
Physician assistant is John Fields' primary specialty in the NPI Registry, under taxonomy code 363A00000X. John Fields is board certified in certified physician assistant by the National Commission on Certification of Physician Assistants (NCCPA). John Fields is licensed in Texas.
Specialties and state licenses
- Physician assistant, TexasPrimary
Clinical focus
Dmand AI lists chronic obstructive pulmonary disease (COPD) and joint pain among the conditions John Fields treats.
Physician assistants near John Fields
Counts of physician assistants with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
John H. Fields billed Medicare for 105 services in 2024
CMS data shows 105 Medicare services from John Fields across 2 procedure codes in 2024, for 121 Medicare patients. Medicare paid $2,883 for them.
Where John Fields' Medicare services took place, 2024
- In an office7269%
- In a facility3331%
John Fields compared with the California median for physician assistants, 2024
- John Fields
- California median
- Medicare services
- 105vs 20449% below
- Medicare patients
- 121vs 10515% above
- Part D claims
- 28vs 24388% below
Medians across 7,065 physician assistants in California with Dmand AI profiles that report each measure.
John Fields' most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for John Fields?
Medicare shows one payer. Book a meeting to get commercial claims data for John Fields and other physician assistants in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
John H. Fields treated 121 Medicare patients in 2026, average age 73
CMS counts 121 Medicare patients who saw John Fields in 2026. The largest group is 65 to 74, with 59 patients. 68% of them have high cholesterol, and 64% have high blood pressure. 22% are also on Medicaid. Their average risk score is 1.02, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts John Fields' median patient age at 51, with 61% women.
John Fields' Medicare patients by age, 2026
CMS leaves out age groups with fewer than 11 patients.
John Fields' Medicare patients by sex, 2026
- Women6856%
- Men5344%
Chronic conditions among John Fields' Medicare patients, 2026
- High cholesterol68%
- High blood pressure64%
- Arthritis47%
- Anxiety31%
- Diabetes23%
- Mood disorders18%
- COPD16%
- Depression16%
Share of Medicare patients with each condition. A patient can have several.
John Fields' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 51
Patient panel by sex, all payers
- Women61%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2026 data
John H. Fields wrote 172 Medicare Part D claims in 2026
In 2026, John Fields wrote 172 Medicare Part D claims for 89 patients. 91% of them were for generic drugs. CMS names the drug for 28 of them, across 2 drugs with 11 or more claims each, at $132 in total drug cost.
John Fields' Part D claims by kind of drug, 2026
- Generic157 claims91%
- Brand-name and other15 claims9%
John Fields' most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in John Fields' Part D claims, 2026
- Antibiotics36%62 of 172 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2026 data
How John H. Fields takes part in Medicare
John Fields accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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John H. Fields received $19 in industry payments in 2025
CMS Open Payments shows 1 general payment to John Fields from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. CeQur Corporation paid the most, $19.
Companies that paid John Fields the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
John H. Fields is board certified in certified physician assistant
- Board certified in certified physician assistant
Source: Dmand AI Professional Profile Data
Sources for John H. Fields's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about John H. Fields
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is John H. Fields' NPI number?
John H. Fields' NPI number is 1730179433. It was assigned on October 24, 2005, and it is active in the NPI Registry.
What does John H. Fields specialize in?
John H. Fields is a physician assistant in Sonora, California. The primary specialty in the NPI Registry is Physician Assistant (taxonomy code 363A00000X).
Where does John H. Fields practice?
John Fields practices at 1000 Greenley Road, Sonora, CA 95370. John Fields' primary practice is Adventist Health Sonora in Sonora, California, part of Adventist Health. Dmand AI also links John Fields to 3 medical groups and 1 community health center, and a free account names each one.
What is John H. Fields' office phone number?
The practice phone on file for John Fields is (209) 536-5000. Dmand AI also checks direct phone and mobile numbers, available with a free account.
What is John H. Fields' email address?
Dmand AI checks professional and personal email addresses for John Fields through healthcare-specific waterfall enrichment. They are available with a free Dmand AI account.
What is John H. Fields' medical license number?
John Fields holds Texas license PA04509.
Which hospitals is John H. Fields affiliated with?
John Fields practices at Adventist Health Sonora in Sonora, California. John Fields is also affiliated with Longview ContinueCARE Hospital.
What medical group is John H. Fields part of?
John Fields is linked to Northeast Texas Emergency Physicians. Dmand AI links John Fields to 3 more medical groups, named with a free account.
Who does John H. Fields practice with?
Dmand AI links 63 HCPs to John Fields' primary medical group, 9 of them physician assistants. A free account lists them, with verified contacts.
Does John H. Fields accept Medicare?
Yes. CMS data shows John Fields billed Medicare for 105 services in 2024, and John Fields accepts Medicare assignment.
Show 7 more questionsShow fewer questions
How many Medicare patients does John H. Fields see?
CMS counts 121 Medicare patients who saw John Fields in 2026, with an average age of 73.
Is John H. Fields board certified?
Yes. John Fields is board certified in certified physician assistant by the National Commission on Certification of Physician Assistants (NCCPA).
What services does John H. Fields bill to Medicare?
In 2024, John Fields' most billed Medicare services were office visit, established patient (99213) and emergency department visit (99284).
What drugs does John H. Fields prescribe most?
In 2024 Medicare Part D data, John Fields' most prescribed drugs by claims were Cephalexin and Prednisone.
Has John H. Fields received payments from drug or device companies?
CMS Open Payments shows $19 in general payments to John Fields from 1 company from 2025 to 2025. The largest total came from CeQur Corporation.
How long has John H. Fields been practicing?
John Fields graduated from medical school in 1995, 31 years ago.
What EHR does John H. Fields' practice use?
Dmand AI tracks the EHR system at Adventist Health Sonora and at 2 more sites and 3 medical groups. The vendor and product are available with a free Dmand AI account.
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