DR. MARK YARWOOD JOHNSON M.D.
NPI 1861421372
Internal Medicine - Gastroenterology in Chula Vista, CA
NPI Status: Active since June 30, 2006
Contact Information
480 4TH AVE
SUITE 506
CHULA VISTA, CA
ZIP 91910
Phone: (619) 585-0313
Fax: (619) 585-0037
- Individual
- Male
- Internal Medicine
- Gastroenterology
- PECOS Enrolled
About MARK JOHNSON
This page provides the complete NPI Profile along with additional information for Mark Johnson, an internist established in Chula Vista, California with a medical specialization in Internal Medicine, focusing in gastroenterology . The healthcare provider is registered in the NPI registry with number 1861421372 assigned on June 2006. The practitioner's primary taxonomy code is 207RG0100X with license number G28163 (CA). The provider is registered as an individual and his NPI record was last updated 19 years ago.
- NPI
- 1861421372
- Provider Name
- DR. MARK YARWOOD JOHNSON M.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 480 4TH AVE SUITE 506 CHULA VISTA, CA 91910
- Location Phone
- (619) 585-0313
- Location Fax
- (619) 585-0037
- Mailing Address
- 65 CATSPAW CPE CORONADO, CA 92118
- Mailing Phone
- (619) 585-0313
- Mailing Fax
- (619) 585-0037
- Is Sole Proprietor?
- No
- Enumeration Date
- 06-30-2006
- Last Update Date
- 10-04-2007
- Code Navigator
An internist like Mark Johnson 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
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 Gastroenterology
- Taxonomy Code
- 207RG0100X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- G28163
- License State
- CA
- Taxonomy Description
- An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
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.
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 |
|---|---|---|---|
| A43635 | OTHER (01) | CA | UPIN |
| 00G281630 | MEDICAID (05) | CA | |
| G28163 | MEDICARE PIN (08) | CA | |
| 100001724 | OTHER (01) | CA | MEDICARE RAILROAD |
Medicare Participation & PECOS Enrollment Status
Mark Johnson 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
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.
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope
Biopsy of large bowel using a flexible endoscope
Colonoscopy
Diagnostic exam of large bowel using a flexible endoscope
Established patient office or other outpatient visit, 30-39 minutes
Established patient office or other outpatient visit, 40-54 minutes
Follow-up hospital inpatient care per day, typically 35 minutes
Initial hospital inpatient care per day, typically 50 minutes
Initial hospital inpatient care per day, typically 70 minutes
Insertion of stomach tube using a flexible endoscope
Insertion of tube into middle small bowel using an endoscope
Measurement of liver stiffness
New patient office or other outpatient visit, 60-74 minutes
Removal of polyps or growths of large bowel using an endoscope with mechanical snare
Upper gastrointestinal (GI) endoscopy for acid reflux
This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.
This service was performed 97 times for 95 patientsA biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.
This service was performed 12 times for 12 patientsA colonoscopy is a medical procedure that allows your doctor to examine your colon (the large intestine). It utilizes a thin, flexible tube with a tiny camera on the end, which is inserted through the rectum. This procedure can help identify issues such as polyps, inflammation, or early signs of cancer. It's usually recommended for people over 50 or those with specific risk factors.
This service was performed for 212 patientsThis procedure, known as a colonoscopy, involves using a flexible tube with a light and camera to examine the large intestine. It helps detect any abnormalities such as polyps or inflammation. It's a standard procedure to ensure gut health.
This service was performed 51 times for 48 patientsThis 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 79 times for 65 patientsThis 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 170 times for 111 patientsFollow-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 528 times for 146 patientsInitial 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 patientsInitial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
This service was performed 109 times for 102 patientsThis procedure involves the use of a flexible endoscope, a thin tube with a light and camera, to insert a stomach tube. It helps doctors view and access your stomach without surgery. It's typically performed under sedation to ensure comfort.
This service was performed 21 times for 19 patientsThis procedure involves placing a small tube into the middle part of your small intestine. An endoscope, a thin, flexible tube with a light and camera, helps locate the right spot. It's a common, safe procedure to deliver nutrition or medication, or to collect samples for testing.
This service was performed 17 times for 15 patientsMeasurement of liver stiffness is a non-invasive procedure that helps assess the health of your liver. It uses sound waves to detect the hardness of the liver tissue, which can indicate conditions like fibrosis or cirrhosis. It's a simple, painless test that provides valuable information about your liver's health.
This service was performed 62 times for 53 patientsThis 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 79 times for 79 patientsThis procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.
This service was performed 28 times for 26 patientsAn upper GI endoscopy is a procedure to examine your esophagus and stomach using a thin, flexible tube called an endoscope. It helps diagnose conditions like acid reflux by identifying any inflammation or damage. It's generally safe, performed under sedation, and takes about 15-30 minutes.
This service was performed for 267 patientsPhysician Visit Costs
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 91910 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.
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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 1861421372, 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.
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.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
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.
Other Providers at the Same Location
The following 20 providers are registered at the same or a nearby location.
CHULA VISTA, CA 91910
CHULA VISTA, CA 91910
CHULA VISTA, CA 91910
CHULA VISTA, CA 91910
CHULA VISTA, CA 91910
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1861421372, enumerated as an "individual" on June 30, 2006.
The provider is located at 480 4TH AVE SUITE 506 CHULA VISTA, CA 91910 and the phone number is (619) 585-0313.
Internal Medicine with taxonomy code 207RG0100X and a focus in Gastroenterology.
The provider might be accepting Accepts: Medicare, Medicaid and Railroad Medicare. Please consult your insurance carrier or call the provider to verify.
