Dr. Karen L. Fields, MD
- Medicare services, 2024
- 61
- Medicare patients, 2024
- 53
- Part D claims, 2024
- 1,095
- MIPS score, 2024
- 100
- Hospital affiliations
- 1
- Practice address
- 2641 South C Street, Oxnard, CA 93033
- Practice phone
- Call (805) 487-7840
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Maywood Acres Healthcare
Skilled Nursing Facility · Oxnard, California
Find Dr. 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.
Dr. Karen L. Fields is an internist in North Hills, California
Dr. Fields practices at Maywood Acres Healthcare in Oxnard, California.
Dr. Fields' NPI, 1497779656, was assigned on July 27, 2006. Dr. Fields graduated from Universidad Autonoma de Guadalajara in 1984. Dr. Fields holds California license A45315.
- NPI
- 1497779656NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7416043179
- NPI enumeration date
- July 27, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (805) 487-7840
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 68
- Medical school graduation
- 1984
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Karen L. Fields practices in Oxnard and North Hills
Dr. Fields' primary practice is Maywood Acres Healthcare, at 2641 South C Street, Oxnard, CA 93033 in Ventura County. The practice phone is (805) 487-7840. Dr. Fields also practices at Maywood Acres Healthcare, 15034 W Providence Ln, North Hills, CA 91343.
- Maywood Acres HealthcarePrimary2641 South C Street, Oxnard, CA 93033 · Ventura CountyPhone(805) 487-7840
- Maywood Acres Healthcare15034 W Providence Ln, North Hills, CA 91343 · Los Angeles CountyPhone(805) 487-7840
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Dr. Karen L. Fields is affiliated with 6 sites of care
Dr. Fields' primary practice is Maywood Acres Healthcare in Oxnard, California. Dr. Fields is also affiliated with Community Memorial Hospital - Ventura. Dmand AI also links Dr. Fields to 3 more hospices and 1 physician office, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Karen L. Fields' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Fields practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Maywood Acres Healthcare | Available with a free account |
| +5 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Karen L. Fields is one of 16,751 internists in California
Internal medicine is Dr. Fields' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Fields is board certified in internal medicine by the American Board of Internal Medicine. Dr. Fields is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Internists near Dr. Fields
Counts of internists 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
Dr. Karen L. Fields billed Medicare for 61 services in 2024
CMS data shows 61 Medicare services from Dr. Fields across 2 procedure codes in 2024, for 53 Medicare patients. Medicare paid $6,752 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Fields' Medicare services by type, 2021 to 2024
- 2021
- 2024
- Office and hospital visits
- 2021: 9092024: 6193%
Dr. Fields compared with the California median for internists, 2024
- Dr. Fields
- California median
- Medicare services
- 61vs 36183% below
- Medicare patients
- 53vs 15165% below
- Part D claims
- 751vs 42178% above
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. 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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Fields and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Karen L. Fields treated 53 Medicare patients in 2024, average age 78
CMS counts 53 Medicare patients who saw Dr. Fields in 2024. The largest group is 75 to 84, with 20 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 3.01, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Fields' median patient age at 84, with 60% women.
Dr. Fields' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Fields' Medicare patients by sex, 2024
- Women2547%
- Men2853%
Chronic conditions among Dr. Fields' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Mood disorders75%
- Depression74%
- Diabetes64%
- Alzheimer's and dementia62%
- Chronic kidney disease53%
- Arthritis51%
Share of Medicare patients with each condition. A patient can have several.
Dr. Fields' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 84
Patient panel by sex, all payers
- Women60%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Karen L. Fields wrote 1,095 Medicare Part D claims in 2024
In 2024, Dr. Fields wrote 1,095 Medicare Part D claims for 85 patients. 91% of them were for generic drugs. CMS names the drug for 751 of them, across 35 drugs with 11 or more claims each, at $31,225 in total drug cost. In 2023, CMS named 634 claims across 26 drugs.
Dr. Fields' Part D claims by kind of drug, 2024
- Generic1,001 claims91%
- Brand-name and other94 claims9%
Dr. 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 Dr. Fields' Part D claims, 2024
- Opioids4%41 of 1,095 claims
- Antibiotics4%42 of 1,095 claims
- Antipsychotics, patients 65 and over3%38 of 1,095 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 6342024: 75118%
Drugs named by CMS: 35 in 2024, 26 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Karen L. Fields scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Fields for performance year 2024, reported through an alternative payment model (APM). Dr. Fields accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Fields' MIPS scores, performance year 2024
- 100of 100Final score
- 86.3of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Karen L. Fields received $502 in industry payments from 2016 to 2023
CMS Open Payments shows 19 general payments to Dr. Fields from 12 drug and device companies from 2016 to 2023. Food and beverage make up the largest share, 100% of the total. Novo Nordisk Inc paid the most, $148.
General payments to Dr. Fields by program year, 2016 to 2023
Companies that paid Dr. Fields the most, 2016 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Karen L. Fields graduated from Universidad Autonoma de Guadalajara
Dr. Fields graduated from Universidad Autonoma de Guadalajara in 1984.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Dr. Karen L. Fields accepts plans from 3 insurance carriers
Dr. Fields is in network with 3 carriers, including Elevance, HCSC and CMS Medicare. Medicare plans come from the most carriers, 2. Check the plan with the practice before a visit.
- Elevance
- HCSC
- CMS Medicare
Plan types Dr. Fields accepts, by number of carriers
- Medicare2
- PPO2
- EPO1
- HMO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Karen L. 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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation 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)Clinician Public Reporting: Overall MIPS Performance (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 |
| Insurance carriers and plan types | Dmand AI Insurance Network 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 Dr. Karen L. 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 Dr. Karen L. Fields' NPI number?
Dr. Karen L. Fields' NPI number is 1497779656. It was assigned on July 27, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Karen L. Fields?
Dr. Karen L. Fields is an internist in North Hills, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Karen L. Fields practice?
Dr. Fields practices at 2641 South C Street, Oxnard, CA 93033. Dr. Fields also practices at 15034 W Providence Ln, North Hills, CA 91343. Dr. Fields' primary practice is Maywood Acres Healthcare in Oxnard, California. Dmand AI also links Dr. Fields to 3 hospices and 1 physician office.
What is Dr. Karen L. Fields' office phone number?
The practice phone on file for Dr. Fields is (805) 487-7840.
What is Dr. Karen L. Fields' medical license number?
Dr. Fields holds California license A45315.
Which hospitals is Dr. Karen L. Fields affiliated with?
Dr. Fields is affiliated with Community Memorial Hospital - Ventura.
Does Dr. Karen L. Fields accept Medicare?
Yes. CMS data shows Dr. Fields billed Medicare for 61 services in 2024, and Dr. Fields accepts Medicare assignment.
What is Dr. Karen L. Fields' MIPS score?
Dr. Fields' MIPS final score for performance year 2024 is 100 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. Karen L. Fields see?
CMS counts 53 Medicare patients who saw Dr. Fields in 2024, with an average age of 78.
Is Dr. Karen L. Fields board certified?
Yes. Dr. Fields is board certified in internal medicine by the American Board of Internal Medicine.
Show 6 more questionsShow fewer questions
What services does Dr. Karen L. Fields bill to Medicare?
In 2024, Dr. Fields' most billed Medicare services were nursing facility care (99309) and nursing facility care (99310).
Where did Dr. Karen L. Fields go to medical school?
Dr. Fields graduated from Universidad Autonoma de Guadalajara in 1984.
What drugs does Dr. Karen L. Fields prescribe most?
In 2024 Medicare Part D data, Dr. Fields' most prescribed drugs by claims were Atorvastatin Calcium, Gabapentin and Amlodipine Besylate.
Has Dr. Karen L. Fields received payments from drug or device companies?
CMS Open Payments shows $502 in general payments to Dr. Fields from 12 companies from 2016 to 2023. The largest total came from Novo Nordisk Inc.
How long has Dr. Karen L. Fields been practicing?
Dr. Fields graduated from medical school in 1984, 42 years ago.
What insurance does Dr. Karen L. Fields accept?
Dr. Fields is in network with 3 carriers, including Elevance, HCSC and CMS Medicare. Medicare plans come from the most carriers, 2. Check the plan with the practice before a visit.
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