ROBERT GARETH GISH M.D.
NPI 1548281322
Internal Medicine - Hepatology in Folsom, CA

NPI Status: Active since July 21, 2006

Contact Information

1580 CREEKSIDE DR STE 220
FOLSOM, CA
ZIP 95630
Phone: (916) 986-4444
Fax: (916) 983-8563

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  • Individual
  • Male
  • Years of Experience 47
  • Internal Medicine
  • Hepatology
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About ROBERT GISH

This page provides the complete NPI Profile along with additional information for Robert Gish, an internist established in Folsom, California with a medical specialization in Internal Medicine, focusing in hepatology and more than 47 years of experience. He graduated from University Of Kansas School Of Med (kc/wich/sal) in 1980. The healthcare provider is registered in the NPI registry with number 1548281322 assigned on July 2006. The practitioner's primary taxonomy code is 207RI0008X with license number G45632 (CA). The provider is registered as an individual and his NPI record was last updated February 2026.

NPI
1548281322
Provider Name
ROBERT GARETH GISH M.D.
Gender
Male
Entity Type
Individual
Location Address
1580 CREEKSIDE DR STE 220 FOLSOM, CA 95630
Location Phone
(916) 986-4444
Location Fax
(916) 983-8563
Mailing Address
6022 LA JOLLA MESA DR LA JOLLA, CA 92037
Mailing Phone
(858) 229-9865
Medical School Name
UNIVERSITY OF KANSAS SCHOOL OF MED (KC/WICH/SAL)
Graduation Year
1980
Is Sole Proprietor?
No
Enumeration Date
07-21-2006
Last Update Date
02-25-2026
Code Navigator

An internist like Robert Gish is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.

Location Map

Secondary Locations

  • 901 Rancho Ln Ste 250
    Las Vegas, NV 89106
    (702) 383-2224
  • 231 OConnor Dr
    San Jose, CA 95128
    (408) 347-9001
  • 2331 Montpelier Dr Ste B
    San Jose, CA 95116
    (408) 347-9001

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

Internal Medicine Hepatology

Taxonomy Code
207RI0008X
Type
Allopathic & Osteopathic Physicians
License No.
G45632
License State
CA
Taxonomy Description
The discipline of Hepatology encompasses the structure, function, and diseases of the liver and biliary tract. The American Board of Internal Medicine considers Hepatology part of the subspecialty of gastroenterology. Physicians who identify themselves as Hepatologists usually, but not always, have been trained in gastrointestinal programs.

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No. Taxonomy Code Type Classification /
Specialization
License No. (State)
1207RG0100XAllopathic & Osteopathic Physicians

Internal Medicine
Gastroenterology

G45632 (CA)
2207RT0003XAllopathic & Osteopathic Physicians

Internal Medicine
Transplant Hepatology

6940 (NV)

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
00G456320MEDICAID (05)CA 

Medicare Participation & PECOS Enrollment Status

Robert Gish 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.

Robert Gish 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, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.

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: 2769482140

    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: I20090114000521

    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): Yes

  • Eligible to Order or Refer Power Mobility Devices: Yes

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.

Established patient office or other outpatient visit, 40-54 minutes

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

This service was performed 136 times for 62 patients

New patient office or other outpatient visit, 60-74 minutes

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

This service was performed 32 times for 32 patients

Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or

This service refers to extended doctor visits where your healthcare provider spends additional time evaluating and managing your health beyond the primary procedure's required time. This includes each extra 15 minutes spent by the physician on the same day as the primary service.

This service was performed 94 times for 57 patients

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NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1548281322, we treat the final digit (2) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 68. The final step is to find the difference between that total and the next multiple of ten (70 - 68 = 2).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
5
Unchanged
Pos 3
4
Doubled → 8
Pos 4
8
Unchanged
Pos 5
2
Doubled → 4
Pos 6
8
Unchanged
Pos 7
1
Doubled → 2
Pos 8
3
Unchanged
Pos 9
2
Doubled → 4
Check
2
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 4 → 8 2 → 4 1 → 2 2 → 4

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 5 + 8 + 8 + 4 + 8 + 2 + 3 + 4 + 24 = 68

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 68 is 70. The difference is the calculated check digit.

70 - 68 = 2
This NPI is valid
The calculated check digit is 2, which matches the last digit of 1548281322.

Other Providers at the Same Location


The following 4 providers are registered at the same or a nearby location.

Internal Medicine
1580 CREEKSIDE DR STE 220
FOLSOM, CA 95630
Specialist
1580 CREEKSIDE DR STE 220
FOLSOM, CA 95630
Internal Medicine (Gastroenterology)
1580 CREEKSIDE DR STE 220
FOLSOM, CA 95630
Specialist
1580 CREEKSIDE DR STE 220
FOLSOM, CA 95630

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1548281322, enumerated as an "individual" on July 21, 2006.

The provider is located at 1580 CREEKSIDE DR STE 220 FOLSOM, CA 95630 and the phone number is (916) 986-4444.

Internal Medicine with taxonomy code 207RI0008X and a focus in Hepatology.

The provider might be accepting Accepts: Medicare and Medicaid. Please consult your insurance carrier or call the provider to verify.