DR. GREGORY IAN FIELDS PHD
NPI 1902852783
Psychologist - Clinical in Sacramento, CA

NPI Status: Active since May 25, 2006

Contact Information

2825 J ST
SUITE 435
SACRAMENTO, CA
ZIP 95816
Phone: (916) 425-3177

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  • Individual
  • Male
  • Years of Experience 29
  • Psychologist
  • Clinical
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About GREGORY FIELDS

This page provides the complete NPI Profile along with additional information for Gregory Fields, a provider established in Sacramento, California with a medical specialization in Psychologist, focusing in clinical and more than 29 years of experience. He graduated from Texas Tech University Health Science Center School Of Medicine in 1997. The healthcare provider is registered in the NPI registry with number 1902852783 assigned on May 2006. The practitioner's primary taxonomy code is 103TC0700X with license number PSY16113 (CA). The provider is registered as an individual and his NPI record was last updated 12 years ago.

NPI
1902852783
Provider Name
DR. GREGORY IAN FIELDS PHD
Gender
Male
Entity Type
Individual
Location Address
2825 J ST SUITE 435 SACRAMENTO, CA 95816
Location Phone
(916) 425-3177
Mailing Address
2825 J ST SUITE 435 SACRAMENTO, CA 95816
Mailing Phone
(916) 425-3177
Medical School Name
TEXAS TECH UNIVERSITY HEALTH SCIENCE CENTER SCHOOL OF MEDICINE
Graduation Year
1997
Is Sole Proprietor?
No
Enumeration Date
05-25-2006
Last Update Date
08-12-2013
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A clinical psychologist like Gregory Fields assesses, diagnoses, and treats mental, emotional, and behavioral disorders. Clinical psychologists help people deal with problems ranging from short-term personal issues to severe, chronic conditions. Clinical psychologists interview patients, give diagnostic tests, provide psychotherapy and design behavior modification programs to help patients.

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Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Psychologist Clinical

Taxonomy Code
103TC0700X
Type
Behavioral Health & Social Service Providers
License No.
PSY16113
License State
CA
Taxonomy Description
A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.

Insurance Plans Accepted

According to publicly available information the provider might be accepting the following health plans from these health insurance companies:

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

*Please verify directly with this provider to make sure your insurance plan is currently accepted.

Additional Identifiers

The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.

Identifier Type / Code Identifier State Identifier Issuer
ZZZ17916ZMEDICARE ID-TYPE UNSPECIFIED (04)CA 
ZZZ04183ZMEDICARE PIN (08) 
OPL161132MEDICARE PIN (08)CA 

Medicare Participation & PECOS Enrollment Status

Gregory Fields is registered with Medicare and accepts claims assignment, this means the provider accepts the approved amount for the cost of rendered services as full payment. Participating providers may not charge beneficiaries more than the approved amount for their services. Please keep in mind that beneficiaries still have to pay a coinsurance or copayment amount for a visit or service.

Gregory Fields is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging and Durable Medical Equipment (DME).

What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.

  • Is the provider registered in PECOS? Yes

  • PECOS PAC ID: 6608873393

    What is the PECOS Associate Control ID?
    A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.

  • PECOS Enrollment ID: I20061020000438

    What is the Provider Enrollment ID?
    The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.

  • Accepts Medicare Assignment? Yes

    What does it mean "accepts medicare assignment"?
    When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
    A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.

  • Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes

  • Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes

  • Eligible to Order or Refer a Home Health Agency (HHA): No

  • Eligible to Order or Refer Power Mobility Devices: No

Areas of Expertise

The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.

Administration of psychological or neuropsychological test, each additional 30 minutes

This procedure involves administering psychological or neuropsychological tests to evaluate your mental functions. Each additional 30 minutes allows for a more in-depth assessment of your cognitive abilities, emotions, and behavior. It's crucial for accurate diagnosis and treatment planning.

This service was performed 95 times for 44 patients

Administration of psychological or neuropsychological test, first 30 minutes

This procedure involves a health professional conducting a psychological or neuropsychological test. The first 30 minutes typically involve understanding your mental health or brain function through various assessments. This helps in diagnosing and treating mental health disorders effectively.

This service was performed 45 times for 44 patients

Evaluation of neuropsychological test, each additional hour

This service involves further evaluation of your neuropsychological test results beyond the initial hour. It helps to understand your cognitive functioning better, focusing on areas like memory, attention, and problem-solving skills.

This service was performed 53 times for 15 patients

Evaluation of neuropsychological test, first hour

An evaluation of neuropsychological tests is a process to assess your brain's function. It involves tasks designed to measure cognitive abilities such as memory, attention, problem-solving, and language skills. The first hour involves initial testing and observation.

This service was performed 15 times for 15 patients

Evaluation of psychological test, each additional hour

This service involves additional hours spent on assessing psychological tests. It helps to understand your mental health better, identifying any potential issues or disorders. It's a crucial step in creating an effective treatment plan.

This service was performed 32 times for 29 patients

Evaluation of psychological test, first hour

This procedure involves a professional assessing your mental health using standardized tests. It's the initial hour of a process that helps understand your emotional well-being and cognitive abilities. It's completely non-invasive and confidential.

This service was performed 30 times for 29 patients

Exam of neurobehavioral status, first hour

An exam of neurobehavioral status is a medical procedure that evaluates your brain's functions. This includes assessing your cognitive abilities, emotional responses, and behavioral patterns. The first hour of the exam is typically dedicated to this initial evaluation.

This service was performed 15 times for 15 patients

Psychiatric diagnostic evaluation

A psychiatric diagnostic evaluation is a thorough assessment used to identify any mental health conditions you may have. It involves a detailed discussion about your symptoms, thoughts, feelings and behavior patterns. Your medical history and family's mental health history are also considered.

This service was performed 30 times for 29 patients

Physician Visit Costs



The typical physician office visit costs for Medicare beneficiaries in this area are: $45.21 for a new patient copayment and $26.48 for an established patient copayment.

The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.

For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.

The prices below reflect the costs for new and established patients in the 95816 ZIP code area.

New Patients Visit Costs *

The most utilized procedure code for new patients office visits is 99205

  • Average New Patient Price $180.85
  • Minimum New Patient Price $60.44
  • Maximum New Patient Price $180.85
  • Average New Patient Copayment $45.21
  • Minimum New Patient Copayment $15.11
  • Maximum New Patient Copayment $45.21

Established Patients Visit Costs *

The most utilized procedure code for established patients office visits is 99214

  • Average Established Patient Price $105.95
  • Minimum Established Patient Price $19.88
  • Maximum Established Patient Price $148.15
  • Average Established Patient Copayment $26.48
  • Minimum Established Patient Copayment $4.97
  • Maximum Established Patient Copayment $37.03

* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.

Reviews for DR. GREGORY IAN FIELDS PHD

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NPI Validation Check Digit Calculation


The following table explains the step by step NPI number validation process using the ISO standard Luhn algorithm.

Start with the original NPI number, the last digit is the check digit and is not used in the calculation.
1902852783
Step 1: Double the value of the alternate digits, beginning with the rightmost digit.
29021654716
Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24.
2 + 9 + 0 + 2 + 1 + 6 + 5 + 4 + 7 + 1 + 6 + 24 = 67
Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit.
70 - 67 = 33

The NPI number 1902852783 is valid because the calculated check digit 3 using the Luhn validation algorithm matches the last digit of the original NPI number.

Other Providers at the Same Location


The following 20 providers are registered at the same or nearby location.

NPI Name / Type Taxonomy Address
1982686432DR. ELEANORE L. WOLPAW M.D.
Individual
Internal Medicine2825 J ST SUITE 300
SACRAMENTO, CA 95816
(916) 734-7777
1518949965DR. LINDA JANE WOO M.D.
Individual
Internal Medicine2825 J ST STE#300
SACRAMENTO, CA 95816
(916) 734-7777
1508849084DR. MARGARET M. PORTWOOD MD
Individual
Physical Medicine & Rehabilitation (Pain Medicine)2825 J ST STE. 435
SACRAMENTO, CA 95816
(916) 440-8005
1932184108 LISA YI-MEI HO M.D.
Individual
Internal Medicine2825 J ST SUITE 300
SACRAMENTO, CA 95816
(916) 734-7777
1588649354 JOHN TAKEO HOSOUME M.D.
Individual
Internal Medicine2825 J ST SUITE 300
SACRAMENTO, CA 95816
(916) 734-7777
1093790743 DENYSE NISHIO M.D.
Individual
Internal Medicine2825 J ST
SACRAMENTO, CA 95816
(916) 734-7777
1609926526 JENNIFER ELAINE DRAPER M.D.
Individual
Internal Medicine2825 J ST SUITE #300
SACRAMENTO, CA 95816
(916) 734-7777
1669591236 JILL MARIE STEINBACHER R.N.
Individual
Registered Nurse2825 J ST STE 400
SACRAMENTO, CA 95816
(916) 734-8036
1477741973 BRIGITTE LEE BERRY M.D.
Individual
Internal Medicine2825 J ST SUITE 300
SACRAMENTO, CA 95816
(916) 734-7777
1417197401OBESITY TREATMENT CENTER, A MEDICAL CORPORATION
Organization
Internal Medicine (Obesity Medicine)2825 J ST SUITE 435
SACRAMENTO, CA 95816
(916) 978-0300
1447493630 TRACY L SMITH RD
Individual
Dietitian, Registered2825 J ST STE 435
SACRAMENTO, CA 95816
(916) 978-0300
1902035181STEPHEN IRA STARK, M.D., INC
Organization
Specialist2825 J ST SUITE 235
SACRAMENTO, CA 95816
(916) 446-3777
1093026817 WENDY ANN CARMICKLE
Individual
Physical Therapist2825 J ST SUITE 440
SACRAMENTO, CA 95816
(916) 492-2110
1386952562MELITA N. MOORE,MD INC.
Organization
Physical Medicine & Rehabilitation (Sports Medicine)2825 J ST SUITE 440
SACRAMENTO, CA 95816
(916) 492-2110
1356640783WELLFIT, INCORPORATED
Organization
Physical Medicine & Rehabilitation (Sports Medicine)2825 J ST SUITE 440
SACRAMENTO, CA 95816
(916) 492-2110
1659648202UNIVERSITY OF CALIFORNIA DAVIS
Organization
Clinic/Center (Medical Specialty)2825 J ST SUITE 400
SACRAMENTO, CA 95816
(916) 734-4490
1720212913 LISA MARTINE TAMI RD
Individual
Dietitian, Registered2825 J ST SUITE 435
SACRAMENTO, CA 95816
(916) 978-0300
1841540564 ARLINE S. YEN M.D.
Individual
Internal Medicine (Endocrinology, Diabetes & Metabolism)2825 J ST SUITE 435
SACRAMENTO, CA 95816
(916) 436-1733
1619997897 LISA S WOODWARD N.P.
Individual
Nurse Practitioner (Obstetrics & Gynecology)2825 J ST
SACRAMENTO, CA 95816
(916) 978-0300
1801949144MS. JANET LYNNE MOORE MS RD
Individual
Dietitian, Registered2825 J ST 435
SACRAMENTO, CA 95816
(916) 978-0300

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1902852783, enumerated in the NPI registry as an "individual" on May 25, 2006

The provider is located at 2825 J St Suite 435 Sacramento, Ca 95816 and the phone number is (916) 425-3177

The provider's speciality is Psychologist with taxonomy code 103TC0700X with a focus in Clinical

The provider has more than 29 years of experience. He graduated from Texas Tech University Health Science Center School Of Medicine in 1997.

The provider might be accepting Accepts: Medicare and Medicaid. Please consult your insurance carrier or call the provider to make sure your health plan is currently accepted.

Yes, as of June 20, 2025 the provider is registered in PECOS and is eligible to order health care services or supplies for Medicare patients. If you are a beneficiary the provider is eligible to order or refer: Part B Clinical Laboratory and Imaging and Durable Medical Equipment (DME).

Medicare beneficiaries should expect a typical cost of $180.85 with an average copayment of $45.21 for new patient appointments. Established patients should expect a typical charge of $105.95 and an average copayment of 26.48. Please review your insurance plan or contact the provider directly to determine your specific costs.

The most common procedures or services performed by this practitioner are: Administration of psychological or neuropsychological test, each additional 30 minutes, Administration of psychological or neuropsychological test, first 30 minutes, Evaluation of neuropsychological test, each additional hour, Evaluation of neuropsychological test, first hour, Evaluation of psychological test, each additional hour, Evaluation of psychological test, first hour, Exam of neurobehavioral status, first hour and Psychiatric diagnostic evaluation.

This NPI record was last updated on May 25, 2006. To officially update your NPI information contact the National Plan and Provider Enumeration System (NPPES) at 1-800-465-3203 (NPI Toll-Free) or by email at [email protected].
NPI Profile data is regularly updated with the latest NPI registry information, if you would like to update or remove your NPI Profile in this website please contact us.