CPC key terms

The numeric and alphanumeric classification volume that organizes diagnosis codes by body system and chapter, showing code hierarchy, includes and excludes notes, and required seventh characters.

The ICD-10-CM volume used to look up a diagnosis by main term first, then subterm, before verifying the code in the Tabular List. Never code from the index alone.

A note stating that two conditions cannot be reported together because they are mutually exclusive; the excluded code is a distinct, unrelated condition rather than a component of the coded condition.

A note indicating that the excluded condition is not part of the condition represented by the code, so both may be reported together when each is documented and clinically relevant.

An additional character required at certain ICD-10-CM codes to capture episode of care, laterality, or encounter type. Omitting it makes the code invalid and unprocessable.

A code used when documentation does not support a more specific diagnosis. Report it only when the record truly lacks detail, and query the provider rather than guessing.

A single ICD-10-CM code that fully captures two diagnoses, a diagnosis with an associated manifestation, or a diagnosis with a related complication, replacing the need for multiple codes.

An instructional note requiring the underlying condition to be sequenced before the manifestation or complication code, reflecting the causal relationship between the two documented conditions.

A note directing the coder to report a secondary code that adds detail the primary code does not contain, such as an organism or a manifestation, when documented.

The condition established after study to be chiefly responsible for the inpatient admission. Sequencing it first drives MS-DRG assignment and inpatient payment.

For outpatient and physician claims, the diagnosis reported first on the claim. It should represent the main reason for the encounter, though it need not be the most severe condition.

A flag on inpatient claims showing whether a condition was present when the patient was admitted. Hospitals report it to support quality reporting and payment adjustments for hospital-acquired conditions.

A five-digit procedure code for established services and procedures that have met criteria for clinical efficacy and widespread use, maintained by the AMA and updated annually.

A temporary five-character alphanumeric code assigned to emerging technology, services, or procedures without established widespread use, used to gather data for possible future Category I conversion.

A five-character alphanumeric code beginning with a letter, used for drugs, supplies, durable medical equipment, and services not represented in CPT, maintained by CMS.

A CPT code describing a service always performed with a primary procedure. It is never reported alone and is exempt from multiple procedure reduction rules.

The bundle of pre-operative, intra-operative, and post-operative services included in a surgical code payment, with postoperative days varying by major versus minor procedure classification.

Appended to an evaluation and management service to show it was significant, separately identifiable, and above the usual pre- or post-operative care of a procedure performed the same day.

Reports an unrelated evaluation and management service during the postoperative period of a procedure, indicating the service was not part of the surgical package.

Appended to an evaluation and management service when the encounter resulted in the initial decision to perform surgery, removing the service from the global surgical package.

Indicates that a procedure or service was distinct and independent from other services on the same day, used to bypass bundling edits when no more specific modifier applies.

CMS edits that define code pairs generally not reportable together, including procedure-to-procedure and medically unlikely edits, with modifier indicators showing when an override is permitted.

A payment rule reducing fees for the second and subsequent surgical procedures in the same operative session, applied by ranking procedures by allowed amount.

A CPT category covering cognitive services such as office visits, hospital visits, and consultations, selected by documented history, examination, and medical decision making or time.

The complexity element of E/M selection based on number and complexity of problems addressed, amount of data reviewed, and risk of complications, morbidity, or mortality.

The cumulative minutes on the date of the encounter spent in face-to-face and non-face-to-face activities by the reporting practitioner, used to select E/M level when counseling and coordination dominate.

An encounter in a facility setting where a physician and non-physician practitioner each furnish part of the E/M service; billing rules follow the practitioner who performed the substantive portion.

A service furnished by auxiliary personnel under a physician's direct supervision and billed under the physician's number, allowed only when the service is part of the physician's plan of care.

The requirement that services be reasonable and necessary for diagnosis or treatment of illness or injury, judged against accepted standards and the documentation in the record.

A written notice given to a Medicare beneficiary before a service likely to be denied as not medically necessary, shifting financial liability to the patient when properly executed.

A Medicare contractor policy stating which services are covered and under what clinical conditions in a specific jurisdiction, including covered and non-covered diagnosis lists.

A CMS national policy that defines whether and under what circumstances Medicare covers a specific service, applying uniformly across all contractors and jurisdictions.

The Medicare payment method for hospital outpatient departments and ambulatory surgical centers, assigning services to ambulatory payment classifications with published payment rates.

A grouping of clinically similar outpatient services that share a payment rate under the outpatient prospective payment system, with packaging rules for ancillary items.

A facility that performs outpatient surgical procedures and is paid under a separate prospective payment system based on covered surgical procedures and device categories.

A four-digit code on the UB-04 claim identifying the type of service or accommodation furnished, paired with HCPCS codes to describe what was provided.

A formal, non-leading communication asking the provider to clarify, specify, or resolve conflicting documentation so the record supports accurate code assignment.

A condition that develops during an inpatient stay and was not present on admission. Certain categories trigger reduced Medicare payment for the entire discharge.

Reporting a service at a higher level of payment than the documentation supports. It is a compliance violation that can trigger audits, recoupment, and civil or criminal liability.