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Monday 8am - 5pm Tuesday 8am - 5pm Wednesday 8am - 5pm Thursday 8am - 5pm Friday 8am - 5pm

Pillar Primary Care

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Knoxville, TN
Pillar Primary Care

Pillar Primary Care is Knoxville's oldest and largest direct primary care practice. They care for patients of all ages.

Dr. Mark B McColl is board certified in both Internal Medicine and Pediatrics and Dr. Luke Howell is board certified in Family Medicine. The Pillar PC direct primary care allows patients to have more access to care regardless of insurance coverage. This membership style program includes no cost visits, most in house labs for free, and many send out blood labs are also included free with membership. All other services are offered at 60-90% off retail pricing.

02/05/2026

Most “lab memberships” charge per test.
At Pillar Primary Care, labs are part of your care.

Every new adult patient receives a comprehensive baseline lab evaluation included with membership — 50+ individual health markers, such as:

✔ Blood counts
✔ Immune system function
✔ Glucose
✔ Insulin
✔ Hemoglobin A1c
✔ Lipid Panel
✔ Kidney Function
✔ Liver inflammation markers
✔ Hemoglobin A1c (long term glucose control)
✔ Insulin
✔ Thyroid (TSH) or Prostate Specific Antigen (PSA)
✔ Cardiovascular Inflammation (hsCRP)
✔ Urinalysis

For patients addressing insulin resistance, metabolic health or diabetes, we also include quarterly metabolic labs:

• Glucose
• Kidney Function
• Liver inflammation markers
• Insulin
• Hemoglobin A1c
• Lipid panel

When additional testing is clinically need, labs are available at transparent, wholesale-style pricing — no inflated retail lab bills.

Labs aren’t an upsell here — they’re part of practicing good medicine.

We have access to the full test menus from both Labcorp and Quest— the two largest national laboratories. This includes Advanced Cardiovascular Markers, Nutritional levels, Male and Female hormones, Autoimmune testing, and much more.

When you need a test, we offer it. No surprise bills either.

Pillarpc.com

02/04/2026

Many clinics sell a prescription.
We provide comprehensive medical care.

At Pillar Primary Care, weight loss does not start with medication.

It starts with the Four Pillars of Health:
• Nutrition
• Exercise
• Sleep
• Stress management

Only after we address these foundations does the fifth pillar become appropriate:
• Medications and supplements (including GLP-1s)

For some patients, medications are helpful.
For others, they’re unnecessary — or even counterproductive without the basics in place.

Studies show weight GAIN is common after starting GLP-1s without the right foundation.

That’s why we don’t offer a one-size-fits-all weight loss package.

Every patient receives an individualized plan, built around:
• Physician-led medical care
• Real-food, protein-forward nutrition with our in-house dietitian
• Habit, behavior, and accountability support from our health coach
• Metabolic health, muscle preservation, and long-term sustainability

If you’re paying extra somewhere else just to obtain a prescription, please know:
👉 This care already exists here
👉 And your health deserves more than medication alone

If weight loss is a goal, let’s talk. We’ll build the right plan — every time, for every patient.

02/01/2026

Pillar PC will open at
noon Monday 2/2.
Reach out to Dr. Howell or Dr. McColl directly if needed.

01/25/2026

Pillar PC will be closed Monday January 26th.
Reach out to Dr. McColl or Dr. Howell directly as needed.

01/08/2026

This month we celebrate 10 years since launching our direct primary care practice! What a journey! Dr. McColl and the Pillar PC team are so grateful for the trust our patients place in us every day.

12/28/2025

Just a reminder that for Monday through Wednesday (29th, 30th, and 31st) the office will only be open in the morning before lunch. We’ll endeavor to see everyone who needs a sick visit appointment before heading home, so call early. We’ll be closed Thursday and Friday. Feel free to text, call, or email Dr. McColl or Dr. Howell if we can help. We’ll be available as usual.

Starting January 5th we’ll be back to a normal office schedule.

12/19/2025

Around the New Year, many of us are creating new goals and plans, especially when it comes to exercise. Regular cardiovascular exercise has many benefits, including improving cholesterol levels (elevating HDL and lowering LDL), enhancing insulin sensitivity, and protection against heart disease. Regular moderate exercise can even help lower blood pressure by up to 3 points over time. 🏊⛹️‍♀️🚴‍♂️
Now is a perfect time to schedule an appointment with Terri to discuss an exercise plan that best fits your goals! 💪

Nystoriak MA, Bhatnagar A. Cardiovascular Effects and Benefits of Exercise. Front Cardiovasc Med. 2018 Sep 28;5:135. doi: 10.3389/fcvm.2018.00135. PMID: 30324108; PMCID: PMC6172294.

12/12/2025

The Pillar PC annual white elephant Christmas Party was a blast! Thank you to all our patients who let us take the afternoon off to celebrate our friendship and the Season. Dr Howell takes the cake as he got an actual white elephant this year. Apparently Marga had been saving it for the last six months for just this occasion.

11/20/2025

Health insurance premiums are skyrocketing. What if you could get 90% of your day to day health needs taken care for less than a coffee per day?

We’ve all experienced where having health COVERAGE doesn’t actually get us health CARE. At Pillar PC, you have direct access to your doctor and their staff by text, email, and phone. There are no copays for visits and many labs are included free with membership. We also offer on site medication dispensing at wholesale price that usually beats GoodRx and retail store discounts.

Given us a call and check out our website at pillarpc.com to learn more.

11/14/2025

🌟 FDA Lifts Black Box Warning on Estrogen Therapy 🌟
After 20+ years, the FDA is removing the black box warning from estrogen for menopause—based on updated science showing benefits outweigh risks when started early (under 60 or within 10 years of menopause).
✅ Proven relief from hot flashes, night sweats & more
✅ Lower risk of osteoporosis, heart disease
✅ No increased breast cancer mortality
A major win for informed menopause management & women’s health. Talk to your doctor! 💙

11/03/2025

We had a special visitor today. Grateful for a healthy delivery for Benedict Mead this weekend! Celebrating with Dr. Howell and his family ❤️

10/27/2025

Seed oils like canola, soybean, and corn oil might be in everything, but they’re not doing your body any favors. High in omega-6 fatty acids, they can drive inflammation when overconsumed, potentially increasing risks of heart disease, obesity, and other chronic issues. They’re often heavily processed, stripping nutrients and adding harmful compounds. Swap them for healthier fats like olive oil, avocado oil, or butter for better balance and less oxidative stress. Your body will thank you!

Address

10437 Hardin Valley Road
Knoxville, TN
37932

Opening Hours

Monday	8am - 5pm
Tuesday	8am - 5pm
Wednesday	8am - 5pm
Thursday	8am - 5pm
Friday	8am - 5pm

Telephone

+18652441800

Website

http://www.pillarpc.com/

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Our Story

Dr. Mark B McColl is board certified in both Internal Medicine and Pediatrics and cares for patients of all ages. His direct primary care program allows patients to have more access to care regardless of insurance coverage. His membership style program starts at less than $1/day and includes no cost visit, most in house labs for free, and many send out blood labs are also included free with membership. All other services are offered at 60-90% off retail pricing.