He Returns From Space With the Hip-Fracture Risk of Someone Up to 16 Years Older. A Broken Hip Before Medicare Could Leave Him Facing Tens of Thousands in Medical Bills

Being an astronaut has its perks, but good health isn’t necessarily one of them. A study in Mayo Clinic Proceedings found that astronauts who spent more than 90 days in space later suffered hip fractures at rates seen in civilians 8 to 16.5 years older. Now picture a hypothetical former astronaut, three years short of Medicare, reading that result. A broken hip at 62 would land before Medicare could pay any of the bill, so his first question is how much of that bill would be his.

His health plan’s summary of benefits answers that question more exactly than the study does. Insurance generally caps what he pays for covered, in-network care, although exclusions and other charges can leave him owing more. Without coverage, he has no comparable protection.

What the Astronaut Study Measured, and What It Can’t Tell You

Researchers surveyed U.S. astronauts about fractures recorded during annual clinical exams and analyzed the data with Bayesian modeling. They found no increase in fractures overall, but hip fractures rose after flights lasting more than 90 days. The comparison starts from an average astronaut age of 62.5, so the long-flight group broke hips at rates expected for civilians aged roughly 70.5 to 79.

That figure describes a group, and a small one. Matthew T. Drake, a co-author of the same editorial, explained: “Although the data on spaceflight-associated bone loss are consistent to date, their main limitation is precision, because sample sizes are small and spaceflights are infrequent.” A higher rate across a group tells you nothing about whether any single veteran of a long mission will fall.

What a Broken Hip Costs Before 65

A peer-reviewed analysis in the Journal of Bone and Joint Surgery put the average estimated hospitalization cost at $13,805 for its reference patient. That study used 2007 discharge data on patients 55 or older, and it included the hospital stay alone. Hip replacement and complications significantly increased costs, and rehab comes on top of that.

For covered, in-network treatment, an insured patient’s share generally stops at the plan’s annual out-of-pocket maximum. For 2026, marketplace plans cap in-network spending at $10,600 for an individual and $21,200 for a family. For 2027, the cap on some bronze plans could reach $15,600 for individual coverage.

Many former astronauts were federal employees, and they keep federal health benefits in retirement if they stayed in the program for the 5 years of service immediately prior to retirement. For that reader, the plan’s cap sets the worst case.

Five-figure bills hit three groups:

• The uninsured, who owe the entire bill with no cap.
• Patients receiving out-of-network care that falls outside federal surprise-billing protections, including certain follow-up treatments.
• Patients whose injury crosses two calendar-year plan years. A December break followed by January rehab can use up two separate out-of-pocket maximums.

Higher Fracture Risk Won’t Get You Medicare Early

Before 65, Medicare eligibility generally comes through qualifying disability benefits, ALS or end-stage renal disease. People receiving Social Security disability benefits ordinarily qualify after 24 months, while ALS eliminates that wait. End-stage renal disease has separate eligibility and coverage-start rules. An elevated fracture risk alone doesn’t qualify someone for Medicare.

After 65, Part A charges a $1,736 inpatient deductible, which covers the first 60 days of inpatient care in a benefit period. Skilled nursing rehab costs $217 per day for days 21 through 100, and Part B carries a $283 annual deductible. With no out-of-pocket cap on Original Medicare, a supplement does the job the marketplace cap did before 65.

A break before 65 won’t keep you from getting supplemental coverage later. During the six-month Medigap open enrollment period that starts when Part B begins, insurance companies must sell you any policy they offer without checking your health history. Once that window closes, insurers in most states can review your health history, and an earlier fracture could affect your eligibility or premiums.

Three Moves to Make Before Pricing Your Own Risk

1. Look up your plan’s in-network out-of-pocket maximum and confirm it is the 2026 figure. Then check that an orthopedic surgeon and an inpatient rehab facility near you are in network. Those two pieces of information turn “tens of thousands” into a specific number.
2. If you are a federal employee, check your five-year health coverage history and eligibility for an immediate retirement annuity before setting a retirement date. Leaving before you meet the requirements can cost you the ability to carry federal health benefits into retirement.
3. If you will reach 65 on COBRA or retiree coverage, enroll in Part B during your Initial Enrollment Period. A Special Enrollment Period requires current active employment, which COBRA and retiree coverage lack. Waiting brings a permanent penalty. Buy your Medigap policy within the open-enrollment window so a pre-65 break never affects your pricing.

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