The Importance of Coding Accuracy in Medical Claims

The Importance of Coding Accuracy in Medical Claims

Coding accuracy means using the exact procedure (CPT) and diagnosis (ICD-10) codes that match your services.


It matters clinically (it reflects quality of care), legally (it must comply with payer rules), and financially (errors can trigger audits or underpayments).


Therapists face specific pitfalls: mismatched therapy codes, incorrect telehealth modifiers, or time discrepancies. Staying accurate keeps claims clean, billing compliant, and patients’ records correct.


We’ll walk through practical steps to improve coding accuracy.


Why Coding Accuracy Matters


Every code on a claim is part of a patient’s medical record. Clinically, accurate codes document a patient’s diagnoses and treatments over time, supporting continuity of care.


Legally, correct coding helps meet CMS and insurer guidelines; mistakes can lead to audits, fines, or recoupments. Financially, errors can mean denied or reduced payments.


For example, billing 90834 (45-min therapy) when a 60-min 90837 was done can trigger a denial and rework. Accurate coding prevents these issues and ensures fair reimbursement.


Trustworthy medical billing companies emphasize accuracy, because precise coding speeds payment and avoids costly appeals.


Common Coding Errors in Therapy


Therapists often encounter these pitfalls:


  1. Code Mismatches: Using the wrong CPT or ICD code. For instance, coding group therapy 90853 when it was actually individual therapy 90834. Or using outdated ICD-9 instead of ICD-10.
  2. Modifier Mistakes: Forgetting modifier 25 (significant E/M on same day) or 95/GT (telehealth). For example, a teletherapy session must use modifier 95 under Medicare rules.
  3. Time Documentation: Billing for longer sessions than recorded. If you bill 90837 (60 min) but your note shows only 50 minutes of therapy, the claim will be questioned.
  4. Credentialing/Scope Issues: A therapist billing a code not in their scope of practice (wrong licensure) will be rejected.
  5. Inconsistent Follow-up: Not updating records if a patient’s diagnosis changes, leading to mismatches on successive claims.

Avoiding these errors starts with good documentation and double-checking before submission.


Step-by-Step Coding Fixes


  1. Pre-Visit Eligibility Checks: At intake, verify the patient’s coverage and any required pre-authorizations. Confirm whether therapy codes are covered benefits.
  2. Use Templates & Checklists: Create chart templates that include fields for CPT, ICD, time spent, and modifiers. A quick checklist (e.g. “code match, modifier, signature”) before billing can catch omissions.
  3. Claim Scrubbing: Many practices run claims through software that flags common errors (missing NPI, mismatched age/Gender rules, etc.). Correct these before submitting.
  4. Timely Reviews: Have a coder or supervisor review charts weekly. Cross-check notes against billed codes. This catches mistakes early.
  5. Appeals & Adjustments: If a claim is denied for coding, address it immediately. Provide clarifying documentation or correct the code and resubmit promptly. Document any corrective actions taken.

By following these steps, therapists ensure each claim accurately reflects the service provided and meets payer requirements.


Documentation Best Practices


Solid notes are the backbone of coding. Write SOAP-formatted notes: Subjective, Objective, Assessment, and Plan. Always include date/time of service, therapy technique used, patient’s symptoms, and treatment goals.


For telehealth, note the mode of visit (video/audio) and patient consent. Use the patient’s exact DSM-5 diagnosis code, not a general term.


For example, if treating severe anxiety, specify F41.1 (Generalized Anxiety Disorder) rather than just “anxiety.” This precision supports your billing and patient care. Keep templates updated to reflect any coding changes and audit your records for compliance routinely.


Telehealth and Modifiers


Since 2020, many therapy services are delivered via telehealth. Use the correct CPT codes with telehealth modifiers: Medicare requires modifier 95 for video visits and place-of-service 02 (or 10/02 for Medicaid in many states).


Verify each payer’s telehealth rules – some allow audio-only (e.g., Medicare temporarily waived certain requirements). Also, apply modifier -GT or -GQ if needed for other payers.


Check that your claims system is set up for telehealth codes so you don’t lose payments for virtual sessions.



Read: Best Medical Billing Solutions for Small and Large


Credentialing, Enrollment, and Training


Ensure every billing therapist is fully credentialed with each insurer before claims are submitted. A practice should regularly verify provider enrollment (e.g. every 6 months).


If credentials lapse, all submitted codes will be denied. Maintain a tracker for enrollment renewals. Also, invest in training: even a brief weekly meeting can keep staff sharp on coding updates (AMA issues new CPT codes annually).


Many small practices consult with professional medical billing companies to provide training and oversight, relieving therapists of the learning curve while improving accuracy.


Real-World Example


A small counseling practice was getting frequent denials for group therapy. On review, they found the billing clerk was using 90853 even when only two patients attended (group minimum is typically three).


The practice updated its policy: if fewer than three clients attend, they switch to individual therapy codes. They also started verifying attendance daily. Within a month, denials dropped sharply.


This shows how clear rules and teamwork (often guided by expert medical billing companies) turn coding accuracy around.


Billing compliance impacts patient care and revenue. Contact our expert Medical billing companies for a free coding audit today. We’ll help ensure your practice’s coding is precise and compliant, so you get paid correctly and avoid audits.