ICD‑10‑CM
Outpatient Coding Guidelines
Laterality & Specificity
Signs, Symptoms & Z Codes
CPT® Book Basics
100

 This is the minimum number of characters an ICD‑10‑CM code can have.

What is three characters?

100

Outpatient coding requires this type of diagnosis coding — not ruled‑out or suspected conditions.

What is coding to the highest degree of certainty?

100

When a code includes laterality, this side is typically represented by the number “1.”

What is the right side?

100

These codes are used when a patient is not currently sick but receives care for a specific reason.

What are Z codes?

100

This organization owns and maintains the CPT® code set.

What is the American Medical Association (AMA)?

200

This character position in ICD‑10‑CM indicates the highest level of specificity

What is the 7th character?

200

 This type of diagnosis is coded first in outpatient encounters.

What is the first‑listed diagnosis?

200

When laterality is required but not documented, this type of code is used.

What is unspecified?

200

This Z code category is used for annual physical exams.

What is Z00?

200

CPT® codes are always this many digits.

What is five digits?

300

These characters are used as placeholders when a code requires a 7th character but lacks enough characters.

What is the “X” placeholder?

300

 These are coded when the provider documents them as the reason for the visit, even if no definitive diagnosis is made.

What are signs and symptoms?

300

These codes require the coder to identify the encounter type: initial, subsequent, or sequela.

What are injury codes?

300

These codes are used when a symptom is not routinely associated with a confirmed diagnosis.

What are additional symptom codes?

300

These three major components make up a CPT® code description.

What are service/procedure, anatomic site, and approach/technique?

400

he first character of every ICD‑10‑CM code is always this type of character.

What is a letter?

400

This term refers to diagnoses documented as “probable,” “suspected,” or “rule out” in outpatient settings.

What are not coded as confirmed conditions?

400

This term refers to the highest level of detail required for ICD‑10‑CM coding.

What is specificity?

400

This Z code category is used for immunizations.

What is Z23?

400

This section of the CPT® book contains Evaluation & Management codes.

What is the E/M section?

500

These three components make up the structure of an ICD‑10‑CM code

 What are category, etiology/anatomic site, and extension?

500

This guideline states that chronic conditions may be coded when they impact patient care or management.

What is the chronic condition coding guideline?

500

This documentation element is essential for selecting the correct 7th character for injuries.

 What is encounter type?

500

These codes are used when a patient presents for follow‑up after treatment has been completed.

What are aftercare Z codes?

500

these codes describe temporary or emerging technology services.

What are Category III CPT® codes?