CCS-P Medical Coding cheat sheet

ICD-10-CM coding follows the Alphabetic Index first, then the Tabular List; the Tabular List governs final code assignment and sequencing.

An Excludes1 note means the two conditions cannot be coded together; an Excludes2 note means the second condition is not included in the first and may be coded if documented.

The seventh character is required in categories such as injuries, fractures, obstetric, and perinatal codes; X is used as a placeholder when earlier characters are insufficient.

In outpatient encounters, code only diagnoses documented as confirmed; suspected, probable, or rule-out conditions are coded as signs or symptoms.

For inpatient principal diagnosis, sequence first the condition established after study to be chiefly responsible for the admission.

Diabetes with a documented complication due to diabetes: assign the diabetes combination code first, then the manifestation code when a separate code is required.

External cause codes (V00-Y99) identify how an injury occurred and are generally not sequenced as the first-listed diagnosis.

Laterality and episode of care (initial, subsequent, sequela) must be supported by documentation; do not default to unspecified when laterality is documented.

Z codes represent health status, history, aftercare, and other factors; they may be first-listed when the encounter is for a non-disease reason.

E/M level is selected by medical decision making or total time on the date of service under the current CPT office/outpatient E/M guidelines; history and exam are not required for level selection.

Modifier 25 reports a significant, separately identifiable E/M service on the same day as a procedure or another service.

Modifier 59 or an X{EPSU} modifier reports a distinct procedural service when an NCCI edit pair is clinically appropriate to override.

The surgical global package includes preoperative, intraoperative, and postoperative care; global periods are 0, 10, or 90 days depending on the procedure.

Add-on codes are designated with a plus sign and must be reported with a primary procedure; they are not stand-alone codes.

Under Medicare multiple procedure reduction, the highest-valued surgical procedure is paid at 100% and each additional procedure at 50%.

HCPCS Level II codes report supplies, drugs, durable medical equipment, and services not described by CPT; J codes report drugs.

NCCI procedure-to-procedure edits and medically unlikely edits must be checked before billing; modifier use depends on the edit's modifier indicator.

Place of service determines facility versus nonfacility payment; nonfacility claims include practice expense for supplies and clinical staff.

Every code must be supported by documentation that establishes medical necessity and the specific service or diagnosis reported.

Incident-to billing requires the service be part of the physician's plan, performed under direct supervision, and allowed by state law and payer policy.

Teaching physician documentation must reflect personal involvement in the key portions of the service; resident documentation alone is insufficient.

An advance beneficiary notice (ABN) must be obtained before a Medicare service the provider expects to be denied as not medically necessary.

A query is appropriate when documentation is inconsistent, ambiguous, or lacks specificity needed to assign a code; leading queries are prohibited.

HIPAA's minimum necessary standard limits protected health information use and disclosure to the least amount needed for the purpose.

National Coverage Determinations and Local Coverage Determinations define Medicare coverage conditions and may require specific documentation.

Documentation amendments must be dated, timed, and authenticated; late entries do not alter the original record.

Medical record retention and release requirements follow federal and state law and payer contracts; HIPAA permits disclosure for treatment, payment, and operations.

Clean claim rate = claims accepted on first submission divided by total claims submitted, multiplied by 100.

Days in accounts receivable = total accounts receivable divided by average daily charges or average daily revenue.

First-pass denial rate = claims denied on initial submission divided by total claims submitted, multiplied by 100.

Charge capture links documented services and supplies to billable codes; missed charges understate revenue and distort data.

Inpatient Medicare payment uses MS-DRGs; outpatient facility payment uses APCs; physician payment uses CPT/HCPCS with relative value units.

Coding audits compare assigned codes to documentation and measure accuracy, compliance, and reimbursement impact.

Recovery Audit Contractors and Medicare Administrative Contractors review claims for improper payments and coverage compliance.

Denial management categorizes denials by reason, root cause, and payer, then tracks appeal and correction outcomes.

Data quality depends on complete documentation, accurate code selection, timely charge entry, and reconciliation of coding to claims.

ICD-10-CM coding follows the Alphabetic Index first, then the Tabular List; the Tabular List governs final code assignment and sequencing.

An Excludes1 note means the two conditions cannot be coded together; an Excludes2 note means the second condition is not included in the first and may be coded if documented.

The seventh character is required in categories such as injuries, fractures, obstetric, and perinatal codes; X is used as a placeholder when earlier characters are insufficient.

In outpatient encounters, code only diagnoses documented as confirmed; suspected, probable, or rule-out conditions are coded as signs or symptoms.

For inpatient principal diagnosis, sequence first the condition established after study to be chiefly responsible for the admission.

Diabetes with a documented complication due to diabetes: assign the diabetes combination code first, then the manifestation code when a separate code is required.

External cause codes (V00-Y99) identify how an injury occurred and are generally not sequenced as the first-listed diagnosis.

Laterality and episode of care (initial, subsequent, sequela) must be supported by documentation; do not default to unspecified when laterality is documented.

Z codes represent health status, history, aftercare, and other factors; they may be first-listed when the encounter is for a non-disease reason.

E/M level is selected by medical decision making or total time on the date of service under the current CPT office/outpatient E/M guidelines; history and exam are not required for level selection.

Modifier 25 reports a significant, separately identifiable E/M service on the same day as a procedure or another service.

Modifier 59 or an X{EPSU} modifier reports a distinct procedural service when an NCCI edit pair is clinically appropriate to override.

The surgical global package includes preoperative, intraoperative, and postoperative care; global periods are 0, 10, or 90 days depending on the procedure.

Add-on codes are designated with a plus sign and must be reported with a primary procedure; they are not stand-alone codes.

Under Medicare multiple procedure reduction, the highest-valued surgical procedure is paid at 100% and each additional procedure at 50%.

HCPCS Level II codes report supplies, drugs, durable medical equipment, and services not described by CPT; J codes report drugs.

NCCI procedure-to-procedure edits and medically unlikely edits must be checked before billing; modifier use depends on the edit's modifier indicator.

Place of service determines facility versus nonfacility payment; nonfacility claims include practice expense for supplies and clinical staff.

Every code must be supported by documentation that establishes medical necessity and the specific service or diagnosis reported.

Incident-to billing requires the service be part of the physician's plan, performed under direct supervision, and allowed by state law and payer policy.

Teaching physician documentation must reflect personal involvement in the key portions of the service; resident documentation alone is insufficient.

An advance beneficiary notice (ABN) must be obtained before a Medicare service the provider expects to be denied as not medically necessary.

A query is appropriate when documentation is inconsistent, ambiguous, or lacks specificity needed to assign a code; leading queries are prohibited.

HIPAA's minimum necessary standard limits protected health information use and disclosure to the least amount needed for the purpose.

National Coverage Determinations and Local Coverage Determinations define Medicare coverage conditions and may require specific documentation.

Documentation amendments must be dated, timed, and authenticated; late entries do not alter the original record.

Medical record retention and release requirements follow federal and state law and payer contracts; HIPAA permits disclosure for treatment, payment, and operations.

Clean claim rate = claims accepted on first submission divided by total claims submitted, multiplied by 100.

Days in accounts receivable = total accounts receivable divided by average daily charges or average daily revenue.

First-pass denial rate = claims denied on initial submission divided by total claims submitted, multiplied by 100.

Charge capture links documented services and supplies to billable codes; missed charges understate revenue and distort data.

Inpatient Medicare payment uses MS-DRGs; outpatient facility payment uses APCs; physician payment uses CPT/HCPCS with relative value units.

Coding audits compare assigned codes to documentation and measure accuracy, compliance, and reimbursement impact.

Recovery Audit Contractors and Medicare Administrative Contractors review claims for improper payments and coverage compliance.

Denial management categorizes denials by reason, root cause, and payer, then tracks appeal and correction outcomes.

Data quality depends on complete documentation, accurate code selection, timely charge entry, and reconciliation of coding to claims.