OMAR A MESARWI MD
NPI 1245430032
Internal Medicine - Critical Care Medicine in San Diego, CA

NPI Status: Active since July 20, 2007

Contact Information

4520 EXECUTIVE DR
SAN DIEGO, CA
ZIP 92121
Phone: (800) 926-8273

Get Directions Write a Review

  • Individual
  • Male
  • Years of Experience 19
  • Internal Medicine
  • Critical Care Medicine
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About OMAR MESARWI

This page provides the complete NPI Profile along with additional information for Omar Mesarwi, an internist established in San Diego, California with a medical specialization in Internal Medicine, focusing in critical care medicine and more than 19 years of experience. He graduated from University Of Texas Southwestern Medical School At Dallas in 2007. The healthcare provider is registered in the NPI registry with number 1245430032 assigned on July 2007. The practitioner's primary taxonomy code is 207RC0200X with license number A144727 (CA). The provider is registered as an individual and his NPI record was last updated June 2026.

NPI
1245430032
Provider Name
OMAR A MESARWI MD
Gender
Male
Entity Type
Individual
Location Address
4520 EXECUTIVE DR SAN DIEGO, CA 92121
Location Phone
(800) 926-8273
Mailing Address
FILE 57326 LOS ANGELES, CA 90074
Mailing Phone
(800) 926-8273
Medical School Name
UNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL SCHOOL AT DALLAS
Graduation Year
2007
Is Sole Proprietor?
No
Enumeration Date
07-20-2007
Last Update Date
06-10-2026
Code Navigator

An internist like Omar Mesarwi 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

  • 200 W Arbor Dr
    San Diego, CA 92103
    (800) 926-8273
  • 9300 Campus Point Dr
    LA Jolla, CA 92037
    (800) 926-8273

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 Critical Care Medicine

Taxonomy Code
207RC0200X
Type
Allopathic & Osteopathic Physicians
License No.
A144727
License State
CA
Taxonomy Description
An internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists.

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)
1207RP1001XAllopathic & Osteopathic Physicians

Internal Medicine
Pulmonary Disease

A144727 (CA)
2207RS0012XAllopathic & Osteopathic Physicians

Internal Medicine
Sleep Medicine

A144727 (CA)

Medicare Participation & PECOS Enrollment Status

Omar Mesarwi 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.

Omar Mesarwi 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: 5496937062

    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: I20161018002000

    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

Provider Referred Orders for Durable Medical Equipment, Devices & Supplies

The following list reflects the services, supplies or durable medical equipment ordered by this provider to a DME supplier on behalf of patients. The information below is derived from Medicare claims data and reflects the BETOS category, HCPCS code information and the number times each service was submitted under the Medicare fee-for-service program.

Durable Medical Equipment

  • DME-Other DME (DE001N)

    Tubing with integrated heating element for use with positive airway pressure device (HCPCS:A4604)

    4 DME suppliers used 60 Medicare Claims 60 Services Paid

  • DME-Other DME (DE001N)

    Full face mask used with positive airway pressure device, each (HCPCS:A7030)

    3 DME suppliers used 18 Medicare Claims 18 Services Paid

  • DME-Other DME (DE001N)

    Face mask interface, replacement for full face mask, each (HCPCS:A7031)

    3 DME suppliers used 19 Medicare Claims 51 Services Paid

  • DME-Other DME (DE001N)

    Cushion for use on nasal mask interface, replacement only, each (HCPCS:A7032)

    5 DME suppliers used 23 Medicare Claims 99 Services Paid

  • DME-Other DME (DE001N)

    Pillow for use on nasal cannula type interface, replacement only, pair (HCPCS:A7033)

    5 DME suppliers used 47 Medicare Claims 239 Services Paid

  • DME-Other DME (DE001N)

    Nasal interface (mask or cannula type) used with positive airway pressure device, with or without head strap (HCPCS:A7034)

    8 DME suppliers used 78 Medicare Claims 78 Services Paid

  • DME-Other DME (DE001N)

    Headgear used with positive airway pressure device (HCPCS:A7035)

    7 DME suppliers used 50 Medicare Claims 50 Services Paid

  • DME-Other DME (DE001N)

    Tubing used with positive airway pressure device (HCPCS:A7037)

    6 DME suppliers used 31 Medicare Claims 31 Services Paid

  • DME-Other DME (DE001N)

    Filter, disposable, used with positive airway pressure device (HCPCS:A7038)

    8 DME suppliers used 94 Medicare Claims 454 Services Paid

  • DME-Other DME (DE001N)

    Water chamber for humidifier, used with positive airway pressure device, replacement, each (HCPCS:A7046)

    6 DME suppliers used 20 Medicare Claims 20 Services Paid

  • DME-Other DME (DE001N)

    Continuous positive airway pressure (cpap) device (HCPCS:E0601)

    2 DME suppliers used 71 Medicare Claims 71 Services Paid

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.

Critical care, first 30-74 minutes

Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.

This service was performed 104 times for 37 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

This service was performed 11 times for 11 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

This service was performed 49 times for 34 patients

Home sleep test (hst) with type iii portable monitor, unattended; minimum of 4 channels: 2 respiratory movement/airflow, 1 ecg/heart rate and 1 oxygen saturation

A Home Sleep Test (HST) with a Type III Portable Monitor is an unattended test that records your breathing, heart rate, and oxygen levels during sleep. This test uses a minimum of 4 channels to monitor these parameters, helping to diagnose sleep disorders.

This service was performed 40 times for 39 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

This service was performed 17 times for 17 patients

Sleep study including heart rate, breathing, airflow, and effort

A sleep study monitors your heart rate, breathing patterns, airflow, and physical effort while you sleep. It helps identify sleep disorders by tracking your sleep stages and cycles. This data aids doctors in diagnosing and treating sleep-related issues.

This service was performed 48 times for 47 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

This service was performed 17 times for 13 patients

Physician Visit Costs



The typical physician office visit costs for Medicare beneficiaries in this area are: $35.05 for a new patient copayment and $27.1 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 92121 ZIP code area.

New Patients Visit Costs *

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

  • Average New Patient Price $140.22
  • Minimum New Patient Price $62.1
  • Maximum New Patient Price $184.71
  • Average New Patient Copayment $35.05
  • Minimum New Patient Copayment $15.52
  • Maximum New Patient Copayment $46.17

Established Patients Visit Costs *

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

  • Average Established Patient Price $108.42
  • Minimum Established Patient Price $20.62
  • Maximum Established Patient Price $151.42
  • Average Established Patient Copayment $27.1
  • Minimum Established Patient Copayment $5.15
  • Maximum Established Patient Copayment $37.85

* 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 OMAR A MESARWI MD

There are currently no reviews for this provider. Be the first person to share your experience with this provider by filling out our review form. Your insights are appreciated and will help others make informed decisions.

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 1245430032, 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 58. The final step is to find the difference between that total and the next multiple of ten (60 - 58 = 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
2
Unchanged
Pos 3
4
Doubled → 8
Pos 4
5
Unchanged
Pos 5
4
Doubled → 8
Pos 6
3
Unchanged
Pos 7
0
Doubled → 0
Pos 8
0
Unchanged
Pos 9
3
Doubled → 6
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 4 → 8 0 → 0 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 2 + 8 + 5 + 8 + 3 + 0 + 0 + 6 + 24 = 58

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

The next multiple of ten after 58 is 60. The difference is the calculated check digit.

60 - 58 = 2
This NPI is valid
The calculated check digit is 2, which matches the last digit of 1245430032.

Other Providers at the Same Location


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

Surgery (Plastic and Reconstructive Surgery)
4520 EXECUTIVE DR, #150
SAN DIEGO, CA 92121
Specialist
4520 EXECUTIVE DR, SUITE 150
SAN DIEGO, CA 92121
Dentist (General Practice)
4520 EXECUTIVE DR, SUITE 250
SAN DIEGO, CA 92121
Dentist
4520 EXECUTIVE DR, SUITE 200
SAN DIEGO, CA 92121
Ophthalmology
4520 EXECUTIVE DR, SUITE #230
SAN DIEGO, CA 92121
Nurse Practitioner (Pediatrics)
4520 EXECUTIVE DR, SUITE 350
SAN DIEGO, CA 92121
Ophthalmology
4520 EXECUTIVE DR, SUITE 230
SAN DIEGO, CA 92121
Clinic/Center (Rehabilitation, Substance Use Disorder)
4520 EXECUTIVE DR, SUITE 225
SAN DIEGO, CA 92121
Specialist/Technologist (Athletic Trainer)
4520 EXECUTIVE DR, STE. PLZ. 1
SAN DIEGO, CA 92121
Dietitian, Registered
4520 EXECUTIVE DR, SUITE PLAZA 1
SAN DIEGO, CA 92121
Contractor
4520 EXECUTIVE DR, STE 225
SAN DIEGO, CA 92121
Nurse Practitioner
4520 EXECUTIVE DR
SAN DIEGO, CA 92121
Plastic Surgery
4520 EXECUTIVE DR, STE 105
SAN DIEGO, CA 92121
Plastic Surgery
4520 EXECUTIVE DR, STE 105
SAN DIEGO, CA 92121
Internal Medicine (Critical Care Medicine)
4520 EXECUTIVE DR
SAN DIEGO, CA 92121
Internal Medicine (Critical Care Medicine)
4520 EXECUTIVE DR
SAN DIEGO, CA 92121
Internal Medicine (Critical Care Medicine)
4520 EXECUTIVE DR
SAN DIEGO, CA 92121
Internal Medicine (Critical Care Medicine)
4520 EXECUTIVE DR
SAN DIEGO, CA 92121
Pharmacist
4520 EXECUTIVE DR
SAN DIEGO, CA 92121
Nurse Practitioner (Family)
4520 EXECUTIVE DR
SAN DIEGO, CA 92121

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1245430032, enumerated as an "individual" on July 20, 2007.

The provider is located at 4520 EXECUTIVE DR SAN DIEGO, CA 92121 and the phone number is (800) 926-8273.

Internal Medicine with taxonomy code 207RC0200X and a focus in Critical Care Medicine.