HOSPITAL MEDICINE SERVICES OF TX, PLLC
NPI 1821917899
Hospitalist in Conroe, TX

Q: What is the provider's specialty?

The provider's specialty is Hospitalist with taxonomy code 208M00000X.

NPI Status: Active since July 14, 2026

Contact Information

504 MEDICAL CENTER BLVD
CONROE, TX
ZIP 77304
Phone: (936) 539-1111

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Newly Listed Provider
This NPI profile has been added to the NPI registry within the last 30 days.

NPPES record last updated: July 14, 2026. Verified against the NPPES registry weekly; last sync: July 19, 2026.

Table of Contents

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

Organization
Hospitalist

About HOSPITAL MEDICINE SERVICES OF TX, PLLC

This page provides the complete NPI Profile along with additional information for Hospital Medicine Services Of Tx, Pllc, a provider established in Conroe, Texas operating as a Hospitalist. The healthcare provider is registered in the NPI registry with number 1821917899 assigned on July 2026. The practitioner's primary taxonomy code is 208M00000X. The provider is registered as an organization and their NPI record was last updated July 2026. Hospital Medicine Services Of Tx, 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 Vyvyan Derouen (President)

NPI: 1821917899
Provider Name: HOSPITAL MEDICINE SERVICES OF TX, PLLC
Entity Type: Organization
Location Address: 504 MEDICAL CENTER BLVD CONROE, TX 77304
Location Phone: (936) 539-1111
Mailing Address: 2000 HEALTH PARK DR BRENTWOOD, TN 37027
Mailing Phone: (615) 373-7406
Is Sole Proprietor?: No
Is Organization Subpart?: Yes
Enumeration Date: 07-14-2026
Last Update Date: 07-14-2026
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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: Hospitalist
Taxonomy Code: 208M00000X
Type: Allopathic & Osteopathic Physicians
Taxonomy Description: Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.

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: VYVYAN DEROUEN
Authorized Official Title: PRESIDENT
Authorized Official Phone: (512) 482-4107

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 1821917899, we treat the final digit (9) 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 71. The final step is to find the difference between that total and the next multiple of ten (80 - 71 = 9).

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 → 4

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 14 → 1 + 4

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 2 → 4 9 → 18 → 9 7 → 14 → 5 9 → 18 → 9

Step 2: Add all digits plus the NPI constant

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

2 + 8 + 4 + 1 + 1 + 8 + 1 + 1 + 4 + 8 + 1 + 8 + 24 = 71

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

The next multiple of ten after 71 is 80. The difference is the calculated check digit.

80 - 71 = 9

This NPI is valid

The calculated check digit is 9, which matches the last digit of 1821917899.