Functional Medicine Index
Verified October 6, 2026

Root Causes Medical Clinic, San Antonio

MD and NP-led functional medicine practice in San Antonio, TX

MD + NPIFMCP · self-reportedTelehealth

Location and hours

Live from Google
Address
19026 Ridgewood Pkwy, Ste 119, San Antonio, TX 78259
Loading details from Google
Rating, hours and phone shown live from Google Maps. Not part of our score.
Google Map · Directions

At a glance

Root Causes Medical Clinic is the only one of the 8 San Antonio practices we list that names an ND, and one of 2 publishing a first-visit price ($600 intake screening with a nurse practitioner). It says it is cash only and membership-based, with telehealth and a free discovery call. Its site lists lupus, thyroid issues and eczema.

First visitNot reported
Follow-ups25 min
Discovery callFree
New patientsNot reported
TelehealthYes
Ages seenNot reported
LanguagesNot reported
Licensed since2003

Pricing

Self-reported · Oct 2026
First visitIntake Screening with a Nurse Practioner
$600

Prices as the practice names its visits on its own site. Confirm current fees before booking.

Insurance and payment

Self-reported · Oct 2026
Insurance for visits
Cash only
Medicare
Not accepted
Medicaid
Not accepted
HSA / FSA cards
Accepted
Practice model
Membership

Check coverage with your plan before booking, and ask whether lab tests are billed separately.

Practitioners

As named on the practice's website.

Derek Guillory, MD

Medical DirectorMD (listed on the practice's site)TX licence · active

Lucas Tims, ND, FABNO

Naturopathic OncologistND, FABNO (listed on the practice's site)

Luke Schulte-Ovalle, Psy D, NRP

PsychologistPsy D, NRP (listed on the practice's site)

Charlotte Widick, APRN, IFMCP

Nurse PractitionerAPRN, IFMCP (listed on the practice's site)

Haley Kraskovic, FNP-C

Nurse PractitionerFNP-C (listed on the practice's site)

Christal Carter, APRN

Nurse PractitionerAPRN (listed on the practice's site)TX licence · current
Measured · public records

Credentials and licensure

PractitionerNPILicenceStatusLicensed since
Derek W Guillory, M.D.1710972880Texas Medical Board · L5751ACTIVE · no public actions2003
Christal Lynn Carter, FNP-C1649915778Texas Board of Nursing · 1035144CURRENT2026
Luke Anthony Schulte1104604206Not checkedNot reported
Haley N Dragoo-Kraskovic, FNP-C1477201788TX licence (from NPPES)Not checkedNot reported

Sources: NPPES NPI Registry, checked October 6, 2026; licence status from Texas Medical Board; Texas Board of Nursing open data. IFMCP status is self-reported.

Labs and services

On-site blood drawsIV therapiesHormone replacement therapyPersonal and group health coaching sessionsNutritionist SupportEmotional/spiritual support with our PsychologistColon hydrotherapyOzone, Bemer, Hugo, and Cryotherapy

As listed on the practice's website.

How we scored Root Causes Medical Clinic

Total 7.6 / 10
  • Credentials & licensure · 25%25 / 25
    4 clinicians matched to NPI records, licence active with no public actions (Texas Medical Board) and clinicians named with credentials on its site.
  • Transparency on pricing and insurance · 25%20 / 25
    Publishes its first-visit price, insurance status and HSA/FSA policy.
  • Access · 25%12 / 25
    Telehealth and free discovery call.
  • Breadth of services · 15%11 / 15
    12 conditions listed and 8 services.
  • Data completeness · 10%8.3 / 10
    10 of 12 key fields verified.

Scores use verified data only. Partner brands can't change a rank or a score. Full methodology

Compare with nearby practices

San Antonio practices ranked next to Root Causes Medical Clinic

See the San Antonio rankings →

Root Causes Medical Clinic: common questions

Does Root Causes Medical Clinic take insurance?

No. Root Causes Medical Clinic says it is cash only, and it lists no in-network insurance carriers. It says it doesn't accept Medicare or Medicaid. The practice says it accepts HSA/FSA cards. Check with your plan administrator before assuming any reimbursement. These details are self-reported from the practice's website.

How much is a first visit at Root Causes Medical Clinic?

The practice publishes $600 for its first visit, which it calls the "Intake Screening with a Nurse Practioner." It doesn't list how many minutes that visit lasts. Before that, it lists a free discovery call. Pricing is self-reported from the practice's website and was verified in October 2026.

Can I see Root Causes Medical Clinic by telehealth?

Yes. Root Causes Medical Clinic says it offers telehealth, but it doesn't name which states it serves. We checked two Texas licences: Derek W Guillory's TX M.D. licence is active with no public actions, and Christal Lynn Carter's TX FNP-C licence is current. If you live outside Texas, confirm with your state board that the clinician is licensed where you are.

Does Root Causes Medical Clinic have a membership?

Yes. Root Causes Medical Clinic lists a membership practice model. Our data doesn't include a membership price or follow-up fee. The published figure we have is the $600 Intake Screening with a Nurse Practioner, plus a free discovery call. Ask the practice directly what a membership includes and what it costs.

Which lab tests does Root Causes Medical Clinic offer?

Our data doesn't name any specific lab tests for Root Causes Medical Clinic. The practice does list on-site blood draws among its services. Ask the practice which tests it orders and whether test fees are separate from the $600 Intake Screening with a Nurse Practioner.

What does Root Causes Medical Clinic treat?

Root Causes Medical Clinic names 12 conditions on its site. Examples include irritable bowel syndrome, lupus, thyroid issues, high blood pressure, weight control, diabetes, eczema and depression. These listings are self-reported from the practice's website. They describe what the practice names, not outcomes. Discuss your own situation with a clinician.

Is this your practice?

Claim it to update prices, insurance and services, and get a “Featured practice” badge for your website that links to this profile.

Sources

  1. NPPES NPI Registry — NPI, credentials, licence numbers and taxonomy
  2. Practice websites — each practice's own website — pricing, insurance, services and conditions (dated per listing)
  3. Texas Medical Board licensee dataset — licence status, issue date and disciplinary status
  4. Texas Board of Nursing APRN + RN datasets — nurse practitioner licence status and board actions
  5. Google Places API (New) — ratings, hours and phone, shown live and not stored

This profile is for information only and isn't medical advice or an endorsement. Confirm credentials, coverage and costs directly with the practice.