CANCER CARE CENTERS OF SOUTH TEXAS
NPI 1336120054
Internal Medicine - Hematology & Oncology in San Antonio, TX

NPI Status: Active since November 09, 2005

Contact Information

4411 MEDICAL DR, STE. 100
SAN ANTONIO, TX
ZIP 78229
Phone: (210) 595-5300
Fax: (210) 614-8740

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  • Organization
  • Internal Medicine
  • Hematology & Oncology

About CANCER CARE CENTERS OF SOUTH TEXAS

This page provides the complete NPI Profile along with additional information for Cancer Care Centers Of South Texas, an internist established in San Antonio, Texas operating as a Internal Medicine, focusing in hematology & oncology . The healthcare provider is registered in the NPI registry with number 1336120054 assigned on November 2005. The practitioner's primary taxonomy code is 207RH0003X with license number E3811 (TX). The provider is registered as an organization and their NPI record was last updated one year ago. The organization operates as a Single Specialty Group with one or more individual practitioners, all of who practice with the same area of specialization. The provider's . The authorized official of this NPI record is Dr. Roger M. Lyons Md (President)

NPI
1336120054
Provider Legal Name
CANCER CARE CENTERS OF SOUTH TEXAS
Other Organization Name
Other Name Type
(6)
Entity Type
Organization
Location Address
4411 MEDICAL DR, STE. 100 SAN ANTONIO, TX 78229
Location Phone
(210) 595-5300
Location Fax
(210) 614-8740
Mailing Address
4411 MEDICAL DR SAN ANTONIO, TX 78229
Mailing Phone
(210) 595-5300
Mailing Fax
(210) 614-8740
Is Sole Proprietor?
No
Is Organization Subpart?
No
Enumeration Date
11-09-2005
Last Update Date
09-11-2025
Code Navigator

An internist like Cancer Care Centers Of South Texas 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 Hematology & Oncology

Taxonomy Code
207RH0003X
Type
Allopathic & Osteopathic Physicians
License No.
E3811
License State
TX
Taxonomy Description
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.

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)
12085R0001XAllopathic & Osteopathic Physicians

Radiology
Radiation Oncology

E3811 (TX)

Group Taxonomy 193400000X MULTIPLE SINGLE SPECIALTY GROUP

This provdier is a business group of one or more individual practitioners, all of who practice with the same area 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

DR. ROGER M. LYONS MD

Authorized Official Title
PRESIDENT
Authorized Official Phone
(210) 595-5300

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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 1336120054, we treat the final digit (4) 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 46. The final step is to find the difference between that total and the next multiple of ten (50 - 46 = 4).

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
3
Unchanged
Pos 3
3
Doubled → 6
Pos 4
6
Unchanged
Pos 5
1
Doubled → 2
Pos 6
2
Unchanged
Pos 7
0
Doubled → 0
Pos 8
0
Unchanged
Pos 9
5
Doubled → 10 → 1 + 0
Check
4
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 3 → 6 1 → 2 0 → 0 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 + 6 + 6 + 2 + 2 + 0 + 0 + 1 + 0 + 24 = 46

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

The next multiple of ten after 46 is 50. The difference is the calculated check digit.

50 - 46 = 4
This NPI is valid
The calculated check digit is 4, which matches the last digit of 1336120054.

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1336120054, enumerated as an "organization" on November 09, 2005.

The provider is located at 4411 MEDICAL DR, STE. 100 SAN ANTONIO, TX 78229 and the phone number is (210) 595-5300.

Internal Medicine with taxonomy code 207RH0003X and a focus in Hematology & Oncology.