Step 3 CCS Cases, Explained

CCS cases are the computer-based case simulations on Day 2 of USMLE Step 3. You get 13 to 14 of them after the multiple-choice blocks, each with a maximum of 10 or 20 minutes of real time, and in each one you manage a single patient by writing orders, moving the clock forward and changing where the patient is cared for (USMLE 2026 Bulletin). There is no answer list: the software records what you order, when, and in which location.

CCS is not graded separately. It feeds into your one three-digit Step 3 score, weighted no more than its share of exam time (2026 Bulletin), so a weak CCS day can pull down a decent multiple-choice performance. This guide covers how a case runs, what the scoring rewards, and how to practise.

By Dr. Sahith Valluru. For The Boards Professor, founded by Dr. Sean Moazezi, DO. Published and last updated October 28, 2026.

CCS at a glance

Checked October 28, 2026. Rules change; the linked page is the authority.

Topic	Official rule	Source
Free official practice	Six CCS practice cases with case-related feedback in the Step 3 Interactive Testing Experience, an instructional video, and a feedback document showing which actions add to, subtract from or do not change the score.	USMLE: Step 3 common questions
Where CCS sits	Day 2 (Advanced Clinical Medicine), about 9 hours: six 45-minute blocks of multiple-choice questions plus 13 to 14 CCS cases, each with a maximum of 10 or 20 minutes of real time.	USMLE 2026 Bulletin of Information
Passing score	200 on the three-digit scale, for exams taken on or after January 1, 2024.	USMLE: results and scoring
Results	Typically within four weeks of the test date; USMLE advises allowing at least eight weeks.	USMLE: results and scoring

How a CCS case runs

Each case opens with a short history and the patient’s vital signs. From there, USMLE describes four things you can do, in any order you choose (USMLE Step 3 common questions):

• Examine. Pick the parts of the physical exam you would do on a real patient. Requesting a history or exam moves simulated time forward on its own.
• Write orders. Type tests, drugs and procedures on the order sheet, one per line. Drugs must be named, generic or trade; the clerk will not accept a class such as “beta-blockers”. You choose the route, but not the dose.
• Advance the clock. Nothing happens until you move simulated time. Results come back, therapies start and the patient gets better or worse only when the clock moves.
• Change location. Move the patient between home, office, emergency department, inpatient ward and intensive care unit.

Once you advance the clock past an order there is no undo, just as on a real ward. Near the end you get the Case-end Instructions screen and a few minutes to add or cancel orders; after that you cannot examine, move the patient or advance time.

What the scoring rewards

USMLE does not publish a CCS answer key, but its feedback document for the practice cases sorts actions into three kinds: those that add to the score, those that subtract from it, and those that change nothing (USMLE practice materials). Read it once before you practise. In our sessions it comes down to four habits:

• Treat the dangerous thing first. An unstable patient needs the airway, IV access, fluids and monitoring ordered before the clock moves, not after the first lab returns.
• Order what you would order on the ward, and stop there. Tests a careful physician would not send, and invasive ones above all, can cost points.
• Use the right setting. Admitting a patient who belongs at home, or leaving a sick one in the office, is part of what is being measured.
• Close the loop. Re-examine or repeat a test at the point in simulated time when you expect a change, and add counselling and prevention before the case ends where the case calls for it.

USMLE also notes that consultants are rarely helpful, since the cases test your own management, and that a patient can worsen despite ideal care (USMLE). A bad turn on screen does not always mean a bad score.

Can you fail CCS and pass Step 3?

There is no separate CCS pass mark. Step 3 reports one three-digit score with a pass or fail outcome, and the passing score is 200 (USMLE scoring). Because CCS counts up to its share of exam time (2026 Bulletin), a strong Day 1 and strong Day 2 multiple-choice blocks can carry weaker cases, and the reverse also holds: residents who leave CCS until the last week often find that the cases cost them more than they expected.

The CCS part of the exam is the one place where practice with the software changes the result directly. Knowing that a patient with chest pain needs an ECG is not the same as typing it, confirming the route and advancing the clock in the right order inside ten minutes.

A practice routine for CCS

1. Learn the software first. Watch USMLE’s instructional video and run the six free practice cases (USMLE Step 3 practice materials). Use a laptop or desktop in Chrome; the software needs a 1920x1080 screen and will not run well on a phone (USMLE).
2. Write a fixed opening. For each type of presentation (unstable, acute but stable, clinic follow-up) keep a short list of what you order before the first clock advance. Typing the same opening every time saves minutes per case.
3. Practise against the timer. Most residents know the medicine and lose the case to time. Do cases with the real limit running, and note where the minutes went.
4. Review like a block of questions. After each case, compare what you did with the feedback: what was missing, what came late, what was unnecessary.
5. Fit it around call. Two or three cases on a day off do more than ten squeezed into the night before the exam.

Commercial case banks such as UWorld’s CCS cases add volume once the free cases feel routine. Use them for repetition of your opening and your clock habits; the free USMLE cases remain the best guide to how the real interface behaves.

Where CCS fits in the two days

Day 1, Foundations of Independent Practice, has no cases. Day 2, Advanced Clinical Medicine, runs about nine hours and puts the cases at the end (2026 Bulletin), after six blocks of questions on diagnosis, management and prognosis (USMLE Step 3 content). That order matters for practice: you meet the cases tired. Do at least one full Day 2 rehearsal with cases after a long run of question blocks, so the first time you manage a simulated patient at hour seven is not on test day.

For the exam’s full layout see the Step 3 format guide, and for a week-by-week plan that builds in CCS see the Step 3 study plan.

Working on CCS with a tutor

Sean Moazezi writes Step 3 questions, and Step 3 residents make up most of his current students. CCS sessions run on screen share: you drive a practice case, he watches the order sheet and the clock, and afterwards you go through each action against the feedback. Sessions fit around rotations, including evenings and Sundays.