NCICS common mistakes
NCICS · Understand the traps and how to avoid them.
Assigning an ICD-10-CM code from just the physician's impression line without reading the full note to confirm the condition was actually managed or treated during the encounter.
Candidates trained on code-lookup drills treat the assessment heading as the answer key and skip the documentation standard that an outpatient diagnosis must be supported as addressed, not merely suspected or ruled out.
What to do instead
For every scenario, read the entire note before coding: locate the assessment, then verify the plan, orders, or medication changes that show the condition was evaluated. If the note says 'rule out' or 'suspected' in the outpatient setting, do not code the condition; code the presenting sign or symptom instead.
Coding to the highest level of specificity the candidate believes is clinically true rather than the level the documentation supports, for example adding a laterality, episode of care, or complication code the note never states.
Candidates with clinical background assume details are 'obvious' from context, but coders may only assign what is documented and must query the provider when a detail is missing.
What to do instead
Adopt a strict rule: if laterality, encounter type (initial/subsequent/sequela), or a causal link is absent from the record, stop and treat it as a documentation gap. In exam items, select the code matching exactly what is written; if none fits, the correct answer is the unspecified or symptom code the note supports.
Overlooking ICD-10-CM conventions such as Excludes1 versus Excludes2, 'code also', 'use additional code', and sequela sequencing when two conditions appear together.
Candidates memorize code descriptors but skim the instructional notes, so they pair mutually exclusive codes or omit a required secondary code.
What to do instead
Build a habit of reading the tabular list entry and its notes for every code considered. Drill the distinction: Excludes1 means never code together, Excludes2 means code both when both are documented. For sequela, sequence the residual condition first and the cause second.
Selecting an E/M level by counting bullet points in the wrong category or by matching the visit type to a familiar code instead of applying the current medical decision making or time rules consistently.
Candidates carry over older key-component habits or mix elements from different levels, and they confuse new-patient with established-patient rules or ignore the substantive portion of time when counseling dominates.
What to do instead
Before choosing a level, state which method you are using (time or MDM) and apply only that method. For MDM, assess problems, data, and risk separately and take the two-of-three result. Confirm patient status from the record, and only use time when total time on the date of the encounter is documented and counseling or coordination dominates.
Misreading the operative report and assigning procedure codes by the procedure title rather than by the documented approach, extent, and what was actually performed, including missing bundled or additional codes.
Titles are short and familiar, so candidates code from them and skip details like laparoscopic versus open approach, graft versus direct repair, or whether a diagnostic scope converted to a surgical scope.
What to do instead
Code from the body of the operative report: identify the approach, the anatomic site, the technique, and any distinct additional services. Then check NCCI edits and the code's parenthetical notes to decide whether a second code is separately reportable or bundled.
Submitting or accepting a claim with a diagnosis code that does not meet medical necessity for the procedure billed, or ignoring the payer's LCD or NCD coverage criteria.
Candidates focus on procedure coding accuracy and treat diagnosis linkage as an afterthought, not realizing that an accurate but unsupported pair still produces a denial.
What to do instead
For each claim, link every procedure to a supporting diagnosis and check the applicable coverage policy's covered diagnoses and documentation requirements. If the record lacks the required criteria, flag it for provider query rather than guessing a diagnosis to force payment.
Entering charges without verifying that the patient's insurance eligibility, benefits, and coordination of benefits are current, then discovering coverage problems only after the claim denies.
Candidates treat registration data as fixed and assume the card on file is correct, but coverage changes monthly and primary/secondary order errors are a leading denial cause.
What to do instead
Treat eligibility verification as a required pre-service step with a documented date and reference number. Confirm active coverage, effective dates, primary versus secondary payer, and any plan limitations, and re-verify when the patient reports a change or the claim denies for coverage reasons.
Filing claims past the payer's timely filing limit or resubmitting a corrected claim as a new claim instead of as a corrected or appeal submission.
Candidates prioritize getting the claim out over tracking submission deadlines, and they do not distinguish clean-claim resubmission from corrected-claim or appeal pathways.
What to do instead
Maintain a claim work queue sorted by filing deadline and escalate anything approaching the limit. When correcting, use the payer's corrected-claim indicator and reference the original claim number; when appealing, follow the appeal timeline and attach the specific documentation the denial cited.
Posting a denial as a simple write-off or rebilling the same claim unchanged instead of reading the remittance advice to identify the exact reason and corrective action.
Candidates under time pressure treat denials as a volume problem, and CARC and RARC codes look like administrative noise rather than a diagnosis of the root cause.
What to do instead
For every denial, record the CARC and RARC, classify it (registration, coding, authorization, medical necessity, timely filing), and route it to the owner of that cause. Correct the underlying data before resubmitting, and track denials by category so repeat causes get fixed upstream.
Reporting a service without a valid prior authorization or referral, or with an authorization that does not match the code, date, or units billed.
Candidates assume authorization is someone else's job or that an approval number covers whatever is eventually performed, but payers deny when the authorized service differs from the billed service.
What to do instead
Verify authorization requirements during scheduling and confirm the approved procedure, date range, and units before the service. At charge entry, reconcile the billed code and units against the authorization; if they differ, obtain an update or expect a denial and prepare the appeal.