DENNIS GREWAL DO
NPI 1538556592
Internal Medicine - Cardiovascular Disease in Santa Ana, CA

NPI Status: Active since April 16, 2015

Contact Information

700 N TUSTIN AVE
SANTA ANA, CA
ZIP 92705
Phone: (714) 245-1444
Fax: (714) 245-1444

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  • Individual
  • Male
  • Years of Experience 11
  • Internal Medicine
  • Cardiovascular Disease
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About DENNIS GREWAL

This page provides the complete NPI Profile along with additional information for Dennis Grewal, an internist established in Santa Ana, California with a medical specialization in Internal Medicine, focusing in cardiovascular disease and more than 11 years of experience. The healthcare provider is registered in the NPI registry with number 1538556592 assigned on April 2015. The practitioner's primary taxonomy code is 207RC0000X with license number 15476 (CA). The provider is registered as an individual and his NPI record was last updated April 2025.

NPI
1538556592
Provider Name
DENNIS GREWAL DO
Other Name
BACHITER GREWAL MD
Other Name Type
Former Name (1)
Gender
Male
Entity Type
Individual
Location Address
700 N TUSTIN AVE SANTA ANA, CA 92705
Location Phone
(714) 245-1444
Location Fax
(714) 245-1444
Mailing Address
700 N TUSTIN AVE SANTA ANA, CA 92705
Mailing Phone
(714) 245-1444
Mailing Fax
(714) 245-1444
Medical School Name
OTHER
Graduation Year
2015
Is Sole Proprietor?
No
Enumeration Date
04-16-2015
Last Update Date
04-07-2025
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An internist like Dennis Grewal 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

  • 16300 Sand Canyon Ave Ste 201
    Irvine, CA 92618
    (949) 753-9150

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 Cardiovascular Disease

Taxonomy Code
207RC0000X
Type
Allopathic & Osteopathic Physicians
License No.
15476
License State
CA
Taxonomy Description
An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.

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)
1207R00000XAllopathic & Osteopathic Physicians

Internal Medicine

20A15476 (CA)

Medicare Participation & PECOS Enrollment Status

Dennis Grewal 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.

Dennis Grewal 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: 1456602028

    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: I20180920000704

    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.

Follow-up hospital inpatient care per day, typically 25 minutes

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

This service was performed 15 times for 12 patients

Heart rhythm review and interpretation of continous external ekg over 8-15 days

This service involves wearing a device for 8-15 days that continuously records your heart's electrical activity. It helps in identifying irregular heart rhythms. The recorded data is then reviewed and interpreted by a healthcare professional for any abnormalities.

This service was performed 14 times for 14 patients

Heart rhythm review, and interpretation of continous external ekg over more than 48 hours up to 7 days

A heart rhythm review involves monitoring your heart's electrical activity for more than 48 hours up to 7 days. Using a device called an external EKG, doctors can track your heartbeats to detect irregularities and help diagnose heart conditions.

This service was performed 11 times for 11 patients

Initial hospital inpatient care per day, typically 50 minutes

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

This service was performed 25 times for 25 patients

Ultrasound of heart blood flow, valves and chambers

An ultrasound of your heart, also known as an echocardiogram, is a test that uses sound waves to create detailed images of your heart. It helps doctors check the health of your heart's chambers, valves, and blood flow.

This service was performed 20 times for 20 patients

Ultrasound of heart with color-depicted blood flow, rate and valve function

An ultrasound of the heart, also known as an echocardiogram, uses sound waves to create pictures of your heart. It shows the structure, movement, and blood flow within your heart. This helps assess the heart's health and function, including the valves and rate.

This service was performed 23 times for 22 patients

Ultrasound of heart with color-depicted blood flow, rate, direction and valve function

This is a heart ultrasound, also known as an echocardiogram. It uses sound waves to create pictures of your heart, showing how blood flows through it. The color depicts the blood flow's speed and direction. It also checks the heart's valves to ensure they're working properly.

This service was performed 96 times for 95 patients

Ultrasound of heart with continuous electrocardiogram (ecg) during rest, exercise and/or drug induced stress with review and report

This procedure involves using ultrasound technology to create images of your heart while you rest, exercise, or undergo drug-induced stress. An ECG continuously monitors your heart's electrical activity. It helps doctors assess heart health and function.

This service was performed 11 times for 11 patients

Physician Visit Costs



The typical physician office visit costs for Medicare beneficiaries in this area are: $35.59 for a new patient copayment and $19.49 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 92705 ZIP code area.

New Patients Visit Costs *

The most utilized procedure code for new patients office visits is 99204

  • Average New Patient Price $142.39
  • Minimum New Patient Price $62.96
  • Maximum New Patient Price $187.6
  • Average New Patient Copayment $35.59
  • Minimum New Patient Copayment $15.74
  • Maximum New Patient Copayment $46.9

Established Patients Visit Costs *

The most utilized procedure code for established patients office visits is 99213

  • Average Established Patient Price $77.96
  • Minimum Established Patient Price $20.84
  • Maximum Established Patient Price $153.61
  • Average Established Patient Copayment $19.49
  • Minimum Established Patient Copayment $5.21
  • Maximum Established Patient Copayment $38.4

* 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 DENNIS GREWAL DO

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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.
1538556592
Step 1: Double the value of the alternate digits, beginning with the rightmost digit.
256810512518
Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24.
2 + 5 + 6 + 8 + 1 + 0 + 5 + 1 + 2 + 5 + 1 + 8 + 24 = 68
Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit.
70 - 68 = 22

The NPI number 1538556592 is valid because the calculated check digit 2 using the Luhn validation algorithm matches the last digit of the original NPI number.

Other Providers at the Same Location


The following 9 providers are registered at the same or nearby location.

NPI Name / Type Taxonomy Address
1033112313DR. BAHRAM ESLAMI M.D.
Individual
Specialist700 N TUSTIN AVE
SANTA ANA, CA 92705
(714) 245-1444
1225031586DR. STEPHEN COHEN M.D.
Individual
Specialist700 N TUSTIN AVE
SANTA ANA, CA 92705
(714) 245-1444
1487659637DR. MAHMOUD ESLAMI FARSANI MD
Individual
Specialist700 N TUSTIN AVE
SANTA ANA, CA 92705
(714) 245-1444
1982609145DR. PAUL MELTZER M.D.
Individual
Specialist700 N TUSTIN AVE
SANTA ANA, CA 92705
(714) 245-1444
1114245750ORANGE COUNTY CARDIOLOGY
Organization
Specialist700 N TUSTIN AVE
SANTA ANA, CA 92705
(714) 245-1444
1831137314CARDIOLOGY SPECIALISTS OF ORANGE COUNTY
Organization
Specialist700 N TUSTIN AVE
SANTA ANA, CA 92705
(714) 245-1444
1942484852DR. ETHAN ARDA YALVAC M.D.
Individual
Internal Medicine (Cardiovascular Disease)700 N TUSTIN AVE
SANTA ANA, CA 92705
(714) 245-1444
1295155588 ALI K ASHTIANI M.D.
Individual
Internal Medicine (Cardiovascular Disease)700 N TUSTIN AVE
SANTA ANA, CA 92705
(714) 245-1444
1396107520DR. AVINASH VARADARAJ SHARMA MD
Individual
Internal Medicine (Interventional Cardiology)700 N TUSTIN AVE
SANTA ANA, CA 92705
(714) 245-1444

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1538556592, enumerated in the NPI registry as an "individual" on April 16, 2015

The provider is located at 700 N Tustin Ave Santa Ana, Ca 92705 and the phone number is (714) 245-1444

The provider's speciality is Internal Medicine with taxonomy code 207RC0000X with a focus in Cardiovascular Disease

The provider has more than 11 years of experience.

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

Medicare beneficiaries should expect a typical cost of $142.39 with an average copayment of $35.59 for new patient appointments. Established patients should expect a typical charge of $77.96 and an average copayment of 19.49. 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: Follow-up hospital inpatient care per day, typically 25 minutes, Heart rhythm review and interpretation of continous external ekg over 8-15 days, Heart rhythm review, and interpretation of continous external ekg over more than 48 hours up to 7 days, Initial hospital inpatient care per day, typically 50 minutes, Ultrasound of heart blood flow, valves and chambers, Ultrasound of heart with color-depicted blood flow, rate and valve function, Ultrasound of heart with color-depicted blood flow, rate, direction and valve function and Ultrasound of heart with continuous electrocardiogram (ecg) during rest, exercise and/or drug induced stress with review and report.

This NPI record was last updated on April 16, 2015. 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].
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