What is HCC coding?
HCC coding maps each diagnosis to a Hierarchical Condition Category, and those categories set what a plan is paid to care for the patient. Document the condition and the payment follows. Miss it and, to the model, it does not exist.
Written by Dr. Tattvam A. Nair, Co-Founder & COO of Layrd. Updated August 2026.
The short answer
CMS groups thousands of ICD-10 diagnosis codes into Hierarchical Condition Categories, each representing conditions of similar expected cost. Each category carries a weight. A patient's weights, combined with demographic factors, produce the RAF score, and the RAF score sets the monthly payment a plan receives for that patient. The chain is short: diagnosis, category, weight, payment.
Only documentation counts
The model counts only what is documented in a face-to-face encounter and coded within the year. It cannot see what a physician knows, what a problem list carries, or what a specialist manages elsewhere. Two panels with identical patients can produce very different risk-adjusted revenue, and the difference is nothing but what the notes say.
| What the note says | What the model sees |
|---|---|
| Diabetes, stable, continue metformin | Diabetes without complication · a lower-weight category |
| Diabetes with stage 3 CKD, eGFR 48 | Two conditions, each weighted correctly |
| CHF managed by cardiology, not mentioned | Nothing. Unmentioned is undocumented. |
The January reset
Every HCC resets on January 1. A patient's diabetes, heart failure, and kidney disease must each be documented again this year to count this year. Practices call this recapture, and it is why risk-adjusted revenue depends less on how sick a panel is than on how reliably its chronic conditions make it into a note every 12 months.
Where it leaks
The leak has two points. At the visit, a condition gets managed but not written, because the physician is working from memory under time pressure. After the visit, a condition gets written but coded without specificity, and "diabetes" lands in a different category than "diabetes with CKD." Retrospective chart reviews exist to catch both, and they are expensive precisely because they happen months too late.
Where Layrd fits
Layrd codes the visit as the note is written: the E&M level with full MDM justification, HCC mapping, and care gap capture, with every code cited back to the chart. The note and its codes agree because one is drawn from the other, at the moment the documentation happens rather than months after it.
What does HCC stand for?
Hierarchical Condition Category. CMS groups thousands of ICD-10 diagnosis codes into categories of similar expected cost. Each category carries a weight, and a patient's weights feed the RAF score that sets payment.
Is HCC coding only for Medicare Advantage?
It started there, but the same logic now runs through ACO arrangements and most value-based contracts. If any part of a practice's revenue is risk-adjusted, HCC capture applies to it.
How often do HCCs need to be documented?
Every calendar year, in a face-to-face encounter. The model resets on January 1, so a chronic condition that goes undocumented for a year stops counting, however permanent it is.
Does Layrd handle HCC coding?
Yes. Codes are drawn from the note as it is written, HCCs are mapped, and every code is cited back to the chart. It is part of Coding & Analytics, which is live today.
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