GARY STEVEN MARCKSTADT MD
NPI 1053364091
Family Medicine in Sioux Falls, SD

NPI Status: Active since May 19, 2006

Contact Information

900 E 54TH ST N STE 200
SIOUX FALLS, SD
ZIP 57104
Phone: (605) 332-2883
Fax: (605) 328-5831

NPI Profile Information
Primary Taxonomy
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Male
Family Medicine

About GARY MARCKSTADT

This page provides the complete NPI Profile along with additional information for Gary Marckstadt, a primary care provider established in Sioux Falls, South Dakota with a medical specialization in Family Medicine. The healthcare provider is registered in the NPI registry with number 1053364091 assigned on May 2006. The practitioner's primary taxonomy code is 207Q00000X with license number 3887 (SD). The provider is registered as an individual and his NPI record was last updated 7 years ago.

NPI: 1053364091
Provider Name: GARY STEVEN MARCKSTADT MD
Gender: Male
Entity Type: Individual
Location Address: 900 E 54TH ST N STE 200 SIOUX FALLS, SD 57104
Location Phone: (605) 332-2883
Location Fax: (605) 328-5831
Mailing Address: 6110 S MINNESOTA AVE SIOUX FALLS, SD 57108
Mailing Phone: (605) 332-2883
Mailing Fax: (605) 328-5831
Is Sole Proprietor?: No
Enumeration Date: 05-19-2006
Last Update Date: 09-06-2019
Code Navigator

A primary care provider (PCP) like Gary Marckstadt sees people with common medical problems. The primary care provider might be a doctor, physician assistant, nurse practitioner or clinic that are usually involved in your long-term care. A PCP might provide preventive care, treat common medical conditions, identify urgent medical problems and refer you to specialists when necessary. Primary care is usually provided in an outpatient facility but if you are admitted to a hospital your PCP may assist in your care. The most common medical conditions seen by primary care providers are: hypertension, upper respiratory tract infections, depression or anxiety, back pain, arthritis, dermatitis, diabetes, urinary tract infections, 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: Family Medicine
Taxonomy Code: 207Q00000X
Type: Allopathic & Osteopathic Physicians
License No.: 3887
License State: SD
Taxonomy Description: Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.

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 1053364091, we treat the final digit (1) 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 59. The final step is to find the difference between that total and the next multiple of ten (60 - 59 = 1).

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

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 10 → 1 + 0

Pos 4

Unchanged

Pos 5

Doubled → 6

Pos 6

Unchanged

Pos 7

Doubled → 8

Pos 8

Unchanged

Pos 9

Doubled → 18 → 1 + 8

Check

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 5 → 10 → 1 3 → 6 4 → 8 9 → 18 → 9

Step 2: Add all digits plus the NPI constant

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

2 + 0 + 1 + 0 + 3 + 6 + 6 + 8 + 0 + 1 + 8 + 24 = 59

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

The next multiple of ten after 59 is 60. The difference is the calculated check digit.

60 - 59 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1053364091.