The simple version

The medical care index fell 0.2% in August, after rising 0.4% in July. Over the last twelve months it is up 1.6%, against 3.4% for all items.

The usual explanation offered for that gap is that the Consumer Price Index (CPI) only counts what a household pays out of pocket. That is half right, and the half it gets wrong is the more interesting one.

The numbers

• The medical care index decreased 0.2% in August 2026, after rising 0.4% in July (Bureau of Labor Statistics, Consumer Price Index news release, August 2026)
• Medical care rose 1.6% over the 12 months ending August 2026, against 3.4% for the all items index, a gap of 1.8 percentage points (BLS; calculated)
• Medical care commodities, the category covering drugs and medical equipment and supplies, are down 2.7% over 12 months (BLS, Consumer Price Index, Table 1, August 2026)
• Medical care services, covering professional services, hospital services and health insurance, are up 2.5% over the same 12 months (BLS, Table 1)
• Those two halves of one category are 5.2 percentage points apart over the year (BLS; calculated)
• Hospital services, physicians' services and prescription drugs were all unchanged in August, while dental services fell 0.6% (BLS, Consumer Price Index news release, August 2026)
• BLS states that while the weight of each medical care index is determined by out-of-pocket spending, the price change the indexes measure is the total reimbursement to providers (BLS, CPI medical care factsheet)
• The factsheet's worked example prices a physician office visit as the patient's $20 copay plus the $80 insurance payment, for a total of $100 (BLS, CPI medical care factsheet)
• BLS states that employer-paid portions of insurance premiums and fully tax-funded care such as Medicare Part A and Medicaid are not treated as out-of-pocket and are therefore not used in weighting the indexes (BLS, CPI medical care factsheet)
• Medical care services carry a relative importance of 6.864 in Table 1 and commodities 1.403, so medical care is about $8.27 of every $100 in the basket the index prices, roughly 83% of it services (BLS, Table 1; calculated)

The price is the whole bill. The weight is your share.

Two separate decisions go into any CPI category. One is what price to track, and the other is how much that category counts toward the total. For medical care those two decisions were made on different bases, and that is the whole puzzle.

On the price side, BLS tracks the total reimbursement to the provider. Its own worked example is a physician office visit: the patient's $20 copay plus the $80 the insurer pays, priced as $100. When that $100 moves, the index moves, whatever the split between the two payers.

On the weighting side, only out-of-pocket spending counts. Employer-paid portions of premiums and fully tax-funded care such as Medicare Part A and Medicaid are not treated as out-of-pocket, so they do not enter the weights.

So the index is not measuring a small copay economy, which is the common assumption. It is tracking the price of the whole transaction, then deciding how loudly that price should count based on the consumer's slice of it.

Health insurance itself is handled separately again. Rather than pricing a premium directly, BLS splits it into the earnings the insurer retains and the benefits it pays out. The health insurance index tracks only the retained portion.

The benefits portion is not discarded. BLS redistributes that weight across the non-insurance medical indexes, in proportion to how much each insurance type pays for that good or service. It ends up inside the physician, hospital and drug indexes rather than sitting in a premium line.

One category name covering two different markets

The August figures show a second thing. Medical care is not one market. Commodities fell 2.7% over the year while services rose 2.5%, a spread of 5.2 percentage points inside one category heading.

The weights decide which half dominates. Table 1 puts services at 6.864 against 1.403 for commodities, so roughly 83% of the medical care weight sits on the side that rose. Our arithmetic on those two published weights is what produces that share.

The Real Cost lens on $100 of the index basket

Relative importance is the percentage of the index's total expenditure weight, so it reads directly as dollars per $100 of the basket. These are the index's proportions, not a household budget.

• Of every $100 in the basket, about $8.27 is medical care, made up of roughly $6.86 of services and $1.40 of commodities (BLS, Table 1; calculated, and the rounded components sum to $8.26 while the total is computed from the unrounded weights)
• That $8.27 reflects out-of-pocket spending only, because that is the basis BLS weights on (BLS, CPI medical care factsheet)
• The prices moving inside those weights are total reimbursements, not copays, so the same category is weighted on one basis and priced on another (BLS, CPI medical care factsheet)
• Employer-paid premium portions and tax-funded care are outside the weight entirely (BLS, CPI medical care factsheet)
• The benefits share of consumer-paid premiums is redistributed into the non-insurance medical indexes rather than dropped (BLS, CPI medical care factsheet)
• Table 1's relative importance figures are as of July 2026; the factsheet's own weight table uses a different reference date and shows slightly different values, so the two will not match exactly (BLS, Table 1; BLS, CPI medical care factsheet)
• These proportions describe the index basket as BLS weights it and are not a claim about any household's medical spending (stated limitation)

Read that way, the medical care line answers a specific question. It asks what the whole price of medical goods and services is doing, and it scales that answer to the share households pay directly. Neither half of that is hidden, and both are published.

What this means

Every index makes separate choices about what it prices and how much that counts, and the two need not rest on the same basis. When a headline figure clashes with experience, those two choices are usually where the difference lives.

BLS publishes a factsheet for each major CPI category setting this out. They are short, and they settle most arguments about what a number covers faster than debating the headline does.

What this is NOT

This is not health advice of any kind, and nothing here concerns treatment, coverage decisions, plan selection, or how to pay a medical bill. This is not a prediction of where medical prices go next, in any subcategory. This is not a claim that the Consumer Price Index is wrong, understated, or mismeasured, and it takes no position on whether the pricing and weighting bases described are the right ones; they are published design decisions and this article reports them. This is not a position on healthcare policy, pricing, insurer conduct, or the cost of the health system, and no figure here describes total national health spending. This is not a claim about what share of a premium any employer pays, which no source cited here states. This is not a statement about any household's medical costs, because relative importance describes the index basket rather than a real budget. The 1.8 and 5.2 percentage point gaps, the combined 8.267 weight, the 83% share, and the dollars-per-$100 conversions are our arithmetic on published BLS figures rather than statistics BLS publishes in that form, and the rounded per-$100 components sum to $8.26 against a total of $8.27 computed from unrounded weights. Table 1 carries no separate aggregate row for medical care, so commodities and services are reported as BLS prints them rather than recombined here, and Table 1's relative importance figures carry a different reference date from the factsheet's own weight table.

Sources

• Bureau of Labor Statistics, Consumer Price Index news release, August 2026, USDL-26-1496: https://www.bls.gov/news.release/cpi.nr0.htm
• Bureau of Labor Statistics, Consumer Price Index Table 1, August 2026: https://www.bls.gov/news.release/cpi.t01.htm
• Bureau of Labor Statistics, CPI medical care factsheet: https://www.bls.gov/cpi/factsheets/medical-care.htm