Active NPI 1497779656 Individual Practitioner Female Practitioner

Dr. Karen L Fields , MD

Internal Medicine • Camarillo, CA

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Karen Fields, MD is a certified Internal Medicine practicing in Camarillo, CA. With approximately 42 years of clinical experience since completing medical education in 1984, Dr. Fields delivers high-quality medical care to the local community at 1601 CARMEN DR STE 106.

Dr. Fields accepts Medicare assignment.

Frequently performed procedures and clinical services include subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least, subsequent nursing facility care with high level of medical decision making, per day, if using time, at least, established patient outpatient office visit. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

1601 Carmen Dr Ste 106

Camarillo, CA 930103103

Telephone 8187883308

Fax 8053898188

Associated Practice Facility / Clinic

🏢 Karen L Fields Md Inc Facility NPI 1144009846

Medicare Profile & Education

Medical School

Other

Graduation Year

1984

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Camarillo, CA

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

42 Yrs +14.8 yrs vs City Avg

City Avg: 27.2 Yrs

State Avg: 26.6 Yrs

Regional Practice Density

26 Specialists

Practicing in Camarillo, CA (18502 Statewide)

Telehealth Adoption Rate

34.6% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

25.5% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Fields (42 Years) 42 Yrs

Camarillo Specialty Average (27.2 Years) 27.2 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99309 Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes	37	33	$189.44	$117.66
99310 Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes	24	12	$193.34	$167.38

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	306	204	$216.36	$101.51
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	268	189	$319.78	$142.24
99442 Telephone medical discussion with physician, 11-20 minutes	99	65	$101.87	$98.94
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	71	61	$129.68	$61.90
99443 Telephone medical discussion with physician, 21-30 minutes	62	49	$146.13	$143.67
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	53	24	$138.00	$110.06
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	34	33	$394.35	$198.57
99441 Telephone medical discussion with physician, 5-10 minutes	16	14	$65.00	$63.02

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	211	112	$125.00	$83.25
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	191	118	$145.00	$120.94
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	151	65	$138.00	$112.75
99443 Telephone medical discussion with physician, 21-30 minutes	120	76	$132.50	$113.68
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	85	56	$64.94	$51.06
G0444 Annual depression screening, 5 to 15 minutes	74	74	$24.24	$20.68
99442 Telephone medical discussion with physician, 11-20 minutes	74	49	$86.08	$79.37
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	25	25	$302.00	$213.91
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	21	21	$55.00	$55.40
99441 Telephone medical discussion with physician, 5-10 minutes	20	15	$65.00	$51.60
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	16	15	$181.00	$161.75
90662 Influenza vaccine split virus, preservative free	13	12	$71.54	$55.45
G0008 Administration of influenza virus vaccine	13	12	$30.00	$18.63
93000 Routine ekg using at least 12 leads including interpretation and report	11	11	$80.00	$19.28

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	372	165	$90.27	$81.69
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	334	140	$60.34	$50.27
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	185	115	$127.05	$119.19
G0444 Annual depression screening, 5 to 15 minutes	121	121	$24.00	$20.33
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	114	57	$138.00	$110.22
96372 Injection beneath the skin or into muscle for therapy, diagnosis, or prevention	99	15	$30.00	$18.73
J3420 Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg	96	15	$10.00	$1.79
G0179 Physician re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians to affirm the initial imp	39	16	$45.00	$44.81
G0008 Administration of influenza virus vaccine	33	32	$30.00	$18.43
90662 Influenza vaccine split virus, preservative free	33	32	$50.00	$49.00
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	22	22	$55.00	$54.78
99496 Transitional care management services for problem of high complexity	17	13	$232.00	$231.00
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	11	11	$302.00	$214.43

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	329	151	$87.00	$79.45
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	227	111	$60.00	$48.42
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	218	87	$138.00	$109.64
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	171	111	$125.00	$116.90
90662 Influenza vaccine split virus, preservative free	66	64	$50.00	$48.97
G0008 Administration of influenza virus vaccine	63	62	$26.35	$22.97
J3420 Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg	46	12	$10.00	$1.95
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	31	28	$302.00	$213.25
G0179 Physician re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians to affirm the initial imp	23	12	$45.00	$44.31
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	20	18	$55.00	$54.12
99239 Hospital discharge day management, more than 30 minutes	12	12	$168.00	$114.69
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	11	11	$170.00	$116.91

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	414	122	$138.00	$109.97
99213 Established patient office or other outpatient visit, typically 15 minutes	339	155	$87.00	$79.59
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	215	120	$60.00	$47.85
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	147	108	$125.00	$116.70
G0444 Annual depression screening, 5 to 15 minutes	64	64	$24.00	$20.02
99497 Advance care planning, first 30 minutes	57	56	$238.55	$86.75
G0008 Administration of influenza virus vaccine	51	49	$25.00	$24.50
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	49	40	$302.06	$213.45
90662 Influenza vaccine split virus, preservative free	46	46	$50.00	$48.05
99239 Hospital discharge day management, more than 30 minutes	43	37	$168.00	$114.54
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	16	16	$181.00	$156.71
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and	15	14	$55.00	$54.12

Medical Specialties & State Licenses

CMS Verified: 2023-09-14

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License CA A45315

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

1 Associated Practitioners

Dr. Lorna Barte , MD

Psychiatry & Neurology - Psychiatry

NPI 1154376762

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

10 Historical Events

📍

Updated Practice Location September 14, 2023

Registered at 1601 CARMEN DR STE 106, CAMARILLO, CA 930103103 (Tel: 8187883308)

📍

Updated Business Mailing Address September 14, 2023

Registered at 1601 CARMEN DR STE 106, CAMARILLO, CA 930103103 (Tel: 8187883308)

📍

Updated Practice Location April 27, 2021

Registered at 5051 VERDUGO WAY STE 110, CAMARILLO, CA 930128679 (Tel: 8053848071)

📍

Updated Business Mailing Address April 27, 2021

Registered at 3400 DATA DR, RANCHO CORDOVA, CA 956707956

✅

NPI Profile Active August 22, 2008

NPI status registered as active in NPPES database

📍

Updated Practice Location August 22, 2008

Registered at 703 N A ST, OXNARD, CA 930304309 (Tel: 8054852340)

📍

Updated Business Mailing Address August 22, 2008

Registered at 703 N A ST, OXNARD, CA 930304309 (Tel: 8054852340)

👤

Provider Name / Credentials Updated August 22, 2008

Recorded as KAREN FIELDS, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) August 22, 2008

Internal Medicine (License #A45315 in CA)

🟢

Initial NPI Registration & Enumeration July 27, 2006

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1497779656

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: July 27, 2006

Last Update: September 14, 2023

Sole Proprietor: No

Update or Correct Profile

Mailing Address

1601 Carmen Dr Ste 106

Camarillo, CA 930103103

Phone: 8187883308

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.