SENIOR DOC DELAWARE PA
NPI 1316828452
Family Medicine in Santa Ana, CA

NPI Status: Active since September 08, 2025

Contact Information

5 HUTTON CENTRE DR STE 950
SANTA ANA, CA
ZIP 92707
Phone: (855) 434-7763
Fax: (949) 281-5550

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

Organization
Family Medicine

About SENIOR DOC DELAWARE PA

This page provides the complete NPI Profile along with additional information for Senior Doc Delaware Pa, a primary care provider established in Santa Ana, California operating as a Family Medicine. The healthcare provider is registered in the NPI registry with number 1316828452 assigned on September 2025. The practitioner's primary taxonomy code is 207Q00000X. The provider is registered as an organization and their NPI record was last updated one year ago. Senior Doc Delaware Pa operates as a Multi-Specialty Group with one or more individual practitioners, who practice different areas of specialization. The authorized official of this NPI record is John Mark Geiss Do (Ceo)

NPI: 1316828452
Provider Name: SENIOR DOC DELAWARE PA
Entity Type: Organization
Location Address: 5 HUTTON CENTRE DR STE 950 SANTA ANA, CA 92707
Location Phone: (855) 434-7763
Location Fax: (949) 281-5550
Mailing Address: 5 HUTTON CENTRE DR STE 950 SANTA ANA, CA 92707
Mailing Phone: (855) 434-7763
Mailing Fax: (949) 281-5550
Is Sole Proprietor?: No
Is Organization Subpart?: No
Enumeration Date: 09-08-2025
Last Update Date: 09-08-2025
Code Navigator

A primary care provider (PCP) like Senior Doc Delaware Pa 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
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.

Group Taxonomy 193200000X MULTI-SPECIALTY GROUP

This provider is a business group of one or more individual practitioners, who practice with different areas of specialization.

Authorized Official

The authorized official is the designated individual with the legal authority to make changes to the provider’s official NPI record. For organizations, the authorized official must be a general partner, chairman of the board, CEO, CFO or a direct owner holding at least a 5 percent stake in the medical organization.

Authorized Official Name: JOHN MARK GEISS DO
Authorized Official Title: CEO
Authorized Official Phone: (657) 315-0858

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 1316828452, 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

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 2

Pos 4

Unchanged

Pos 5

Doubled → 16 → 1 + 6

Pos 6

Unchanged

Pos 7

Doubled → 16 → 1 + 6

Pos 8

Unchanged

Pos 9

Doubled → 10 → 1 + 0

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 1 → 2 8 → 16 → 7 8 → 16 → 7 5 → 10 → 1

Step 2: Add all digits plus the NPI constant

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

2 + 3 + 2 + 6 + 1 + 6 + 2 + 1 + 6 + 4 + 1 + 0 + 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 1316828452.