The CCS credential — Certified Coding Specialist — is the advanced hospital-based coding certification issued by AHIMA (the American Health Information Management Association). It validates expertise in inpatient coding using ICD-10-CM for diagnoses and ICD-10-PCS for procedures, DRG assignment, and the compliance rules that govern hospital health information management. The exam is four hours long, computer-based, and combines traditional multiple-choice questions with hands-on medical record coding cases that require you to assign actual codes from a record. Passing requires a scaled score of 300 — and the medical record coding section is where many candidates fall short without sufficient hands-on practice.
This page provides a free printable PDF covering the core knowledge areas tested on the CCS exam. Download it, print it, and work through the questions during offline study sessions. For scored interactive practice that mirrors the question format used by AHIMA, use our ccs certification practice tests to drill individual content domains and track your accuracy before exam day.
The CCS exam tests the full scope of inpatient coding — not just code selection, but the guidelines, compliance rules, and reimbursement implications that govern hospital health information departments. Candidates who study only code lookup without mastering UHDDS sequencing rules, DRG logic, and query compliance frequently pass the multiple-choice section but struggle on the medical record cases.
ICD-10-CM governs all diagnosis coding in inpatient settings. The Uniform Hospital Discharge Data Set (UHDDS) guidelines determine sequencing: the principal diagnosis is defined as the condition established after study to be chiefly responsible for the admission, even if it was not the admitting diagnosis. The distinction between "chiefly responsible for the admission" and "present at the time of admission" is a commonly tested concept. When two or more diagnoses equally meet the principal diagnosis definition, the UHDDS allows coding either one first — but the order still affects DRG assignment and reimbursement.
Secondary diagnoses must meet the UHDDS threshold: they are coded only if they require clinical evaluation, therapeutic treatment, diagnostic procedures, extended length of stay, or increased nursing care. Conditions that are documented but do not meet any of these criteria are not coded as secondary diagnoses. The Present on Admission (POA) indicator is assigned to every diagnosis and flags whether the condition existed at admission — a critical data point for hospital quality reporting and payer audits. POA indicators of "Y" (yes), "N" (no), "U" (unknown), and "W" (clinically undetermined) each have specific coding guidance.
ICD-10-PCS replaces the ICD-9-CM Volume 3 procedure classification used in older coding systems. Every PCS code is exactly seven alphanumeric characters. The code structure is built character by character: Section (character 1), Body System (character 2), Root Operation (character 3), Body Part (character 4), Approach (character 5), Device (character 6), and Qualifier (character 7). Understanding the root operations is the most heavily tested element of PCS on the CCS exam.
Root operations define the objective of the procedure. Excision removes a portion of a body part; Resection removes the entire body part; Extraction pulls out a body part without cutting; Repair restores a body part to its normal structure. The approach character distinguishes open, percutaneous, percutaneous endoscopic, via natural or artificial opening, and via natural or artificial opening endoscopic procedures. Body part values are specific — "Stomach" and "Jejunum" are separate body parts even though they are both in the gastrointestinal body system. Coding a procedure to the wrong body part is a common error that changes the DRG and creates a compliance risk.
Medicare Severity Diagnosis Related Groups (MS-DRGs) determine inpatient hospital reimbursement under the Medicare Inpatient Prospective Payment System (IPPS). Each MS-DRG carries a relative weight that, multiplied by the hospital's base rate, produces the payment amount for that case. Accurate code sequencing directly affects which DRG is assigned — two cases with identical clinical content but different principal diagnoses can land in different DRGs and produce different payments.
Complications and Comorbidities (CCs) and Major Complications and Comorbidities (MCCs) are secondary diagnoses that upgrade a DRG when present. An MCC typically upgrades a base DRG to a higher-paying variant; a CC upgrades it to a mid-level variant. Understanding which diagnoses qualify as MCCs versus CCs — and which are excluded from upgrading certain DRGs because they are "principal diagnosis exclusions" — is directly tested on the CCS exam. The CCS candidate must know not only how to code a secondary diagnosis but also whether it will affect DRG assignment in a given clinical scenario.
Coding compliance is an area that distinguishes the CCS from purely technical coding credentials. AHIMA and the Official Guidelines for Coding and Reporting require that codes reflect what is documented in the medical record. When documentation is ambiguous, incomplete, or conflicting, coders are expected to query the attending physician for clarification rather than make assumptions or choose a code that maximizes reimbursement.
A compliant query is specific to the clinical situation, presents possible options without leading the physician toward a particular answer, and is submitted in a format approved by the facility's compliance policy. Leading queries — those that suggest a particular diagnosis or procedure to the physician — are a compliance violation. The CCS exam presents query scenarios and asks whether a given query is appropriate, and if not, what the correct approach would be. Sepsis coding is a frequent topic in this context: the Sepsis-3 clinical definition (infection plus organ dysfunction) does not map directly to ICD-10-CM coding guidelines, so physician documentation must clearly support the sepsis code before it is assigned.
Several clinical specialty areas receive disproportionate exam weight because they involve complex coding rules and high compliance risk. Sepsis requires documentation of both the underlying infection and the organ dysfunction to support code assignment. The UHDDS rules for sequencing sepsis with a localized infection (such as pneumonia) are tested regularly — the guidelines specify precise sequencing based on whether sepsis or the localized infection was chiefly responsible for the admission.
Newborn coding uses a separate chapter in ICD-10-CM and has distinct rules for the birth admission versus subsequent admissions. Perinatal conditions (those originating in the perinatal period) are coded even if the encounter is after the perinatal period has ended. Obstetric coding in chapter 15 of ICD-10-CM uses a 7th-character final character to identify the trimester or episode of care. Neoplasm coding requires coders to correctly identify whether a tumor is primary, secondary (metastatic), in situ, benign, or of uncertain or unspecified behavior — and to sequence primary and metastatic sites according to the reason for the admission. These specialty areas together account for a substantial portion of the medical record coding section of the CCS exam.
The CCS exam rewards coders who understand the clinical context behind code selection — not just the mechanics of code lookup. Practicing with real medical record scenarios, applying UHDDS sequencing logic, and working through DRG assignment exercises will prepare you far better than vocabulary review alone. The interactive ccs certification practice tests on this site include clinical scenario questions modeled on the types that appear on the actual AHIMA exam, giving you targeted practice in the content areas that matter most for your score.