HORIZON ALTUS PLLC
NPI 1124979471
Emergency Medicine in Houston, TX
NPI Status: Active since February 04, 2026
Contact Information
1535 WEST LOOP S STE 300
HOUSTON, TX
ZIP 77027
Phone: (800) 417-0470
Fax: (832) 219-3228
- Organization
- Emergency Medicine
About HORIZON ALTUS PLLC
This page provides the complete NPI Profile along with additional information for Horizon Altus Pllc, a provider established in Houston, Texas operating as a Emergency Medicine. The healthcare provider is registered in the NPI registry with number 1124979471 assigned on February 2026. The practitioner's primary taxonomy code is 207P00000X. The provider is registered as an organization and their NPI record was last updated April 2026. Horizon Altus Pllc 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 Darleen Callahan (Vice President, Revenue Cycle)
- NPI
- 1124979471
- Provider Name
- HORIZON ALTUS PLLC
- Entity Type
- Organization
- Location Address
- 1535 WEST LOOP S STE 300 HOUSTON, TX 77027
- Location Phone
- (800) 417-0470
- Location Fax
- (832) 219-3228
- Mailing Address
- 1535 WEST LOOP S STE 300 HOUSTON, TX 77027
- Mailing Phone
- (800) 417-0470
- Mailing Fax
- (832) 219-3228
- Is Sole Proprietor?
- No
- Is Organization Subpart?
- No
- Enumeration Date
- 02-04-2026
- Last Update Date
- 04-17-2026
- Code Navigator
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
Emergency Medicine
- Taxonomy Code
- 207P00000X
- Type
- Allopathic & Osteopathic Physicians
- Taxonomy Description
- An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
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.
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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 1124979471, 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 69. The final step is to find the difference between that total and the next multiple of ten (70 - 69 = 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.
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 69 is 70. The difference is the calculated check digit.
Other Providers at the Same Location
The following 2 providers are registered at the same or a nearby location.
HOUSTON, TX 77027
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1124979471, enumerated as an "organization" on February 04, 2026.
The provider is located at 1535 WEST LOOP S STE 300 HOUSTON, TX 77027 and the phone number is (800) 417-0470.
Emergency Medicine with taxonomy code 207P00000X.
