PRC + Medicare for Native Seniors with Cancer History in Coconino County AZ: What the Referral Gap Looks Like When Flagstaff Medical Center Is Your Only 4-Star Option — and Tuba City Has No Emergency Room

What Is PRC (Purchased/Referred Care) and Why Does It Matter Specifically for Cancer Patients in Coconino County?

Let's be clear about something that gets muddled in most healthcare reporting: PRC is not a charity program. It is not a government handout. It is a treaty obligation — the United States purchased over 500 million acres of Native land with promises that included healthcare. PRC is the mechanism by which IHS pays for specialized care it cannot provide within its own facilities. For a Native elder who survived breast cancer, colon cancer, prostate cancer, or any other malignancy — and who lives on or near the Navajo Nation in Coconino County — PRC is what's supposed to bridge the gap between what Tuba City Regional can deliver and what oncology follow-up actually requires: imaging, specialist consults, possibly chemotherapy, radiation, or surgical intervention.

Here is the problem in plain language: PRC funds are appropriated by Congress annually and have been chronically underfunded for decades. The Indian Health Service estimates its funding level at roughly 56 cents for every dollar needed nationally. In a county where the only fully CMS-rated acute care hospital sits in Flagstaff — and the tribal facility that serves the Navajo Nation has no CMS quality rating in the Hospital Compare database — the gap between what's promised and what's delivered is not a budget line. It is a medical reality our elders live with every single day.

What Are All 4 Hospitals in Coconino County, and Which Ones Can Actually Handle Cancer Follow-Up?

CMS Hospital Compare lists exactly 4 hospitals in Coconino County, Arizona. If you're trying to understand where a PRC referral will land — or where your Medicare plan's network actually exists — you need to know all four. Here they are, with no cherry-picking:

The Guidance Center is a psychiatric facility — important for cancer survivors dealing with depression, and we'll return to that — but it is not an oncology provider. Page Hospital is a Critical Access Hospital, a federal designation that protects rural hospitals from Medicare payment cuts but does not indicate oncology capability. For cancer follow-up — imaging interpretation, infusion services, surgical oncology, radiation oncology — Flagstaff Medical Center is functionally the only option in Coconino County. And it sits in the county's population center, not anywhere near the communities of Tuba City, Cameron, Leupp, or the Gap.

How Does Medicare Interact with PRC for Cancer Diagnosis, Treatment, and Follow-Up — and Who Bills First?

This is the question Patient Benefits Coordinators at IHS facilities spend most of their day answering. The answer has not changed, but it confuses everyone — including, sometimes, the billing departments at the hospitals that receive PRC referrals.

The coordination rule is straightforward: If a Native elder has Medicare, Medicare is billed first. Always. IHS and PRC are payers of last resort. This means:

The phrase "if authorized" in that table is doing a lot of heavy lifting. PRC authorization must happen before the service. If your elder walks into Flagstaff Medical Center for an oncology appointment without a PRC authorization number, and they're on Original Medicare, Medicare pays 80% — but the elder may be on the hook for the 20% coinsurance themselves, potentially thousands of dollars, unless they have a Medigap (supplemental) policy. If they're on Medicare Advantage, the plan's own network and cost-sharing rules apply instead, which creates yet another layer of confusion.

Coconino County Health Indicators Relevant to Cancer Survivorship (2022–2023)

These CDC PLACES figures are for the entire county population (144,472 residents). Native communities, which are disproportionately concentrated in the western and northern parts of the county, typically carry higher rates across most of these indicators.

That 22.5% depression rate — one in four adults — is not a footnote. Cancer survivorship and depression are deeply linked in the medical literature. A Native elder who went through chemotherapy, who lost relatives during the pandemic, who lives 80 miles from the nearest oncologist — that elder is navigating grief, trauma, and a healthcare system that was never designed with them in mind. And Coconino County's one psychiatric facility, The Guidance Center in Flagstaff, has no emergency services and no CMS rating. (CDC PLACES 2023; CMS Hospital Compare 2026)

Should a Native Elder with Cancer History in Coconino County Be on Medicare Advantage or Original Medicare?

I am not going to tell you which plan to choose. That is not what this desk does. What I will tell you is what the landscape looks like — and why the choice matters more for cancer patients than for almost anyone else.

Medicare Advantage plans operating in Coconino County build provider networks primarily around Flagstaff. Most are HMO-structure plans, which means you need a referral from a primary care physician within the network to see a specialist — including an oncologist. If your PCP is at Tuba City Regional (tribal-operated, not typically in most Advantage networks), you may face a maze: your IHS primary care provider cannot generate the Advantage plan's referral, because they're not in that network. Your PRC coordinator cannot generate the Advantage plan's authorization, because PRC and Medicare Advantage operate on entirely separate authorization tracks.

Here is the option most Native elders don't know they have: A Native American beneficiary can disenroll from a Medicare Advantage plan and return to Original Medicare (Parts A and B) at any time during the year — not just during Open Enrollment in October or January's Special Enrollment Period. This is a federal protection specifically for Native Americans. Original Medicare then covers services at any Medicare-participating provider nationwide, which includes Flagstaff Medical Center and any oncologist who accepts Medicare assignment. PRC coordinates with Original Medicare far more cleanly than it does with Advantage plans.

What About Part D and Oral Cancer Medications? Does the Reservation Pharmacy Count?

This is where I've seen our elders get burned the hardest, and it doesn't show up in the press releases. Oral cancer medications — certain targeted therapies, hormonal therapies like tamoxifen or anastrozole, some newer oral chemotherapy agents — are covered under Medicare Part D, not Part B. Part D is a prescription drug plan. And Part D plans have formularies (approved drug lists) and pharmacy networks.

If your elder's Part D plan does not include the Tuba City Regional pharmacy in its preferred network — or if the IHS pharmacy is considered "out of network" under their plan — they may face dramatically higher cost-sharing for those medications, or be required to use a mail-order pharmacy that ships to a P.O. box they may not reliably access. In communities where mail delivery is inconsistent, a monthly mail-order shipment of tamoxifen is not a logistical abstraction. It's a life-safety issue.

Native Americans with Medicare who also receive care at IHS facilities are eligible for the Low Income Subsidy (LIS, also called "Extra Help") for Part D — and importantly, IHS pharmacies are exempt from cost-sharing under Original Medicare for Native beneficiaries. But this exemption does not automatically apply under Medicare Advantage Part D (MA-PD) plans. If your elder switched to a Medicare Advantage plan that includes drug coverage, the IHS pharmacy exemption may not apply. This is a gap that costs our elders real money every month. (CMS Medicare & Other Health Benefits: Your Guide to Who Pays First; IHS Medicare Billing Q&A)

How Does the 11.2% Mobility Disability Rate Affect Cancer Follow-Up Access in This County?

CDC PLACES 2023 data reports that 11.2% of Coconino County adults have a mobility disability. That is roughly 16,180 people in a county of 144,472. For a Native elder with cancer history who also has a mobility limitation — a common reality for anyone who has undergone major surgery, radiation-related fatigue, or neuropathy from chemotherapy — getting to Flagstaff Medical Center for follow-up imaging or an oncology visit is not a matter of inconvenience. It is a genuine barrier that can mean missed appointments, delayed recurrence detection, and worse outcomes. (CDC PLACES 2023, county population 144,472)

IHS and tribal programs do operate transportation assistance in some areas, but these programs are not uniformly available across Coconino County's 18,661 square miles — one of the largest counties in the contiguous United States. Some Medicare Advantage plans offer non-emergency medical transportation (NEMT) as a supplemental benefit, but network limitations apply. Original Medicare does not cover transportation except in very limited ambulance contexts. This is a gap PRC can sometimes address with transportation authorization, but again: authorization must be obtained in advance, and the funds must be available.

What Should a Native Senior with Cancer History in Coconino County Do Right Now?

Key Phone Numbers and Resources