You've Done the Doctor Visits. You've Done the Tests. You Still Don't Have Answers.
Most patients who find this practice have already been through the system — seen the specialists, run the panels, and been told everything looks "normal." The problem isn't that nothing is wrong. It's that the right questions haven't been asked yet. That's where Dr. Kilcup starts.
Dr. Darrell Kilcup, DC, CFMP, IBUM · In practice since 1991 · One of Phoenix's first Certified Functional Medicine Practitioners
The Sickly Kid Who Couldn't Get Better
From birth to age seven, Dr. Kilcup was chronically ill. Croup, asthma, bronchitis — often all three at once. Conventional medicine had no answers, and every year he got worse.
Out of desperation, his father took him to a chiropractor. His mother was skeptical. What happened next changed the family's understanding of what healing could actually look like — and set the course for Dr. Kilcup's entire career.
That experience is why, 35 years later, when patients arrive having exhausted the conventional system, he doesn't see a dead end. He sees an incomplete investigation.
"You know that health problem you've been dealing with — the one that doctors can't seem to solve, that's stealing your time, energy, and joy? I can help you get to the bottom of that."
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Early ChildhoodChronic respiratory illness — no answers
Years of croup, asthma, and bronchitis. Nothing helped. Every year worse.
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Age 7One chiropractor does what years of medicine couldn't
His father's desperate gamble pays off. The spark that defines a career.
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1991Licensed — Doctor of Chiropractic (DC)
Opens practice in Phoenix. Builds a clinical foundation in neuromusculoskeletal care that is still the structural core of the practice today.
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2013–2015Certified Functional Medicine Practitioner (CFMP)
One of the first CFMPs in Phoenix. Expands into root-cause investigation — comprehensive lab testing, nutrition, gut health, hormones, and protocols for reversing chronic disease rather than managing symptoms.
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2023International Board of Undersea Medicine (IBUM)
Board certification in hyperbaric medicine. Adds a full clinical HBOT program combined with photobiomodulation (red light and near-infrared therapy) — the most complete healing environment he has offered patients.
Three Credential Pillars — One Integrated Practice
Each credential represents a distinct body of training. Together they allow Dr. Kilcup to evaluate and treat patients that other practitioners have been unable to help.
Doctor of Chiropractic
The structural and neurological foundation of the practice. Since 1991, Dr. Kilcup has developed deep expertise in how the spine, nervous system, and musculoskeletal system affect every other system in the body.
Certified Functional Medicine Practitioner
Credentialed 2013–2015 — one of Phoenix's first. Advanced training in root-cause investigation: comprehensive lab work far beyond what a GP orders, nutrition science, gut health, hormonal balance, and evidence-based protocols for reversing chronic disease.
International Board of Undersea Medicine
Board certification in hyperbaric oxygen therapy. Dr. Kilcup runs a clinical HBOT program with pressure dialed to what each patient and condition requires — combined with photobiomodulation for enhanced outcomes.
I Don't Guess. I Test.
Most patients who arrive here have already seen multiple specialists. They've had tests. They've been told everything looks "normal." The problem isn't that nothing is wrong — it's that the right questions haven't been asked yet.
What a GP orders and what Dr. Kilcup orders are not the same list. The investigation starts where conventional medicine stops.
- Root cause first, symptoms second Every protocol begins with identifying why — not just what — before recommending any treatment.
- Comprehensive testing, not standard panels Your GP runs a basic panel. Dr. Kilcup runs 60+ markers. The answers are often in the data conventional medicine never collects.
- Oxygen as medicine HBOT floods tissues with oxygen that triggers healing the body can't initiate on its own. Pressure is precisely matched to what each patient and condition requires.
- Light amplifies healing Photobiomodulation combined with HBOT enhances mitochondrial function. Better outcomes than either therapy alone.
Services at the Clinic
Hyperbaric Oxygen Therapy Functional Medicine Photobiomodulation / Red Light Chiropractic Care Massage Therapy Comprehensive Lab Testing Nutrition Protocols Post-Surgical Recovery Chronic Pain Stroke Recovery CRPS / Neuropathy Brain OptimizationLocated near I-17 & Glendale Ave in Phoenix. Functional medicine available remotely by phone or video — patients seen nationwide.
Become a Patient »Real Results from Real Patients
5 stars across 200+ Google reviews. A sample of what patients experience when they stop managing symptoms and start finding answers.
Finally a doctor who listens and delivers real results for my daughter's complex health issues! From our very first virtual consult — super convenient since we live about an hour away — he took the time to dive deep into her full history, symptoms, and even lifestyle factors we hadn't considered. No rushing, no cookie-cutter plans. After just a few months on his treatment plan: her energy levels are up, the gut pain has nearly vanished, and she even started working full-time — something that was impossible a few months ago. Dr. Kilcup didn't just treat her — he empowered our whole family with education and tools to support her long-term wellness.
Dr. K is an outstanding functional medicine doctor. I have seen him for about 10 years now, moved out of state 5 years ago and have continued care under him remotely. He is extremely knowledgeable, responsive, and goes above and beyond addressing questions or concerns. He truly cares about the health and well being of his patients and has earned my complete trust over the years. I would definitely recommend him to anyone searching for answers on how to feel better, get healthier naturally and increase your chances of living longer.
I spent about 10 years going from specialist to specialist trying to figure out my growing fatigue, unexplained weight gain, uncontrollable migraines, and a few other things that just could not get solved. A friend recommended going the functional medicine route — specifically here. Is it a bit pricey? Yes — but my husband keeps saying "what is the point of money and things if your health isn't letting you serve the Lord with them?" There are so many women told their problems come down to birth control, drinking more water, or stressing less. This is not supposed to be normal. Functional medicine is not a quick solution, but it is a long-term one that is worth every penny.
This place is awesome. Dr. K is incredibly knowledgeable and willing to talk to you for as long as you want about how the tech works. Machinery is top notch. Assistants are great. Most importantly, he's one of these rare doctors that is actually trying to help as many people as he can — as opposed to just push pricing — so the price point is extremely reasonable, and he offers significant discounts for package pricing. I've looked at a lot of different HBOT places and this is by far the best one. Also next to a major freeway if you're coming from elsewhere. It's about a 25-minute drive for me, and I plan to come 5 days a week.
Phoenix-Area Clinic. Remote Care Available Anywhere.
The clinic is located near I-17 and Glendale Ave in Phoenix — accessible from Glendale, Peoria, Paradise Valley, Scottsdale, and the Arrowhead corridor. HBOT is in-office. Functional medicine is available in-office or by phone and video — Dr. Kilcup sees FM patients remotely nationwide.
Become a Patient » or call (602) 864-0304
Ready to Find Real Answers?
If you've been to the doctors, done the tests, and you're still struggling — that's exactly the patient this practice was built for.
Call (602) 864-0304 · Phoenix, Arizona · darrellkilcupdc.com