HAPPY TUMMY NUTRITION, LLC
NPI 1164391579
Dietitian, Registered - Nutrition, Pediatric in Tampa, FL

NPI Status: Active since November 03, 2025

Contact Information

400 N TAMPA ST STE 1550
TAMPA, FL
ZIP 33602
Phone: (813) 590-7565

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  • Organization
  • Dietitian, Registered
  • Nutrition, Pediatric

About HAPPY TUMMY NUTRITION, LLC

This page provides the complete NPI Profile along with additional information for Happy Tummy Nutrition, Llc, a provider established in Tampa, Florida operating as a Dietitian, Registered, focusing in nutrition, pediatric . The healthcare provider is registered in the NPI registry with number 1164391579 assigned on November 2025. The practitioner's primary taxonomy code is 133VN1004X. 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 authorized official of this NPI record is Kristen Fustos Ms, Rdn, Csp, Ld, Cl (Registered Dietitian & Owner)

NPI
1164391579
Provider Name
HAPPY TUMMY NUTRITION, LLC
Entity Type
Organization
Location Address
400 N TAMPA ST STE 1550 TAMPA, FL 33602
Location Phone
(813) 590-7565
Mailing Address
PO BOX 130334 TAMPA, FL 33681
Is Sole Proprietor?
No
Is Organization Subpart?
No
Enumeration Date
11-03-2025
Last Update Date
11-03-2025
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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

Dietitian, Registered Nutrition, Pediatric

Taxonomy Code
133VN1004X
Type
Dietary & Nutritional Service Providers
Taxonomy Description
An individual who is a Board Certified Specialist in Pediatric Nutrition and applies evidence-based nutrition knowledge in providing medical nutrition therapy for pediatric patients. Specialists work directly with healthy and/or ill children (newborn up to 21 years of age) as well as children with special health care needs in a variety of settings (hospitals, community-based and/or family-centered programs, education programs, home, etc.), OR indirectly through management, care coordination, education, quality improvement, or research practice linked specifically to pediatric nutrition.

Group Taxonomy 193400000X 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

KRISTEN FUSTOS MS, RDN, CSP, LD, CL

Authorized Official Title
REGISTERED DIETITIAN & OWNER
Authorized Official Phone
(813) 590-7565

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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 1164391579, 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 61. The final step is to find the difference between that total and the next multiple of ten (70 - 61 = 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
1
Doubled → 2
Pos 2
1
Unchanged
Pos 3
6
Doubled → 12 → 1 + 2
Pos 4
4
Unchanged
Pos 5
3
Doubled → 6
Pos 6
9
Unchanged
Pos 7
1
Doubled → 2
Pos 8
5
Unchanged
Pos 9
7
Doubled → 14 → 1 + 4
Check
9
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 6 → 12 → 3 3 → 6 1 → 2 7 → 14 → 5

Step 2: Add all digits plus the NPI constant

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

2 + 1 + 1 + 2 + 4 + 6 + 9 + 2 + 5 + 1 + 4 + 24 = 61

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

The next multiple of ten after 61 is 70. The difference is the calculated check digit.

70 - 61 = 9
This NPI is valid
The calculated check digit is 9, which matches the last digit of 1164391579.

Other Providers at the Same Location


The following 4 providers are registered at the same or a nearby location.

Psychiatry & Neurology (Geriatric Psychiatry)
400 N TAMPA ST STE 1550
TAMPA, FL 33602
Nurse Practitioner (Family)
400 N TAMPA ST STE 1550
TAMPA, FL 33602
Marriage & Family Therapist
400 N TAMPA ST STE 1550
TAMPA, FL 33602
General Practice
400 N TAMPA ST STE 1550
TAMPA, FL 33602

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1164391579, enumerated as an "organization" on November 03, 2025.

The provider is located at 400 N TAMPA ST STE 1550 TAMPA, FL 33602 and the phone number is (813) 590-7565.

Dietitian, Registered with taxonomy code 133VN1004X and a focus in Nutrition, Pediatric.