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March 29, 2023

Risk Coding for Medical Practices and Outpatient Services

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Introduction to Risk Coding for Medical Practices and Outpatient Services

Where do we find the rules for assigning diagnosis codes in medical practices? The diagnosis codes don’t just get the claim paid, they also determine the patient’s risk score and the risk scores for the entire panel of patients. There are two source citations: the ICD-10-CM book and Official Guidelines, and CMS’s documents about risk coding. This article isn’t about individual codes or conditions. It describes the certain rules related to code selection from ICD-10 and the CMS documents, and the dos and don’ts of assigning diagnosis codes in medical practices for risk adjustment, using the HCC system.

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What is risk adjusted diagnosis coding and why is it used?

Risk adjustment was developed to predict future costs for a group of beneficiaries or subscribers. Now, it is used to normalize cost, quality and outcome for different groups of patients. Accurately assigning diagnosis codes to an individual patient and to a panel of patients communicates the acuity of the patient population being treated.

What are HCCs

Hierarchical Condition Categories (HCCs) were developed by Medicare to pay Medicare Advantage Organizations a monthly fee, based on the disease burden of their patients. HCCs are now used by some Accountable Care Organizations and private payers as one metric in determining future payments.

ICD-10-CM guidelines

When assigning diagnosis codes in physician practices and outpatient departments for HCC coding, use Section I, Conventions, official coding guidelines and chapter specific guidelines and Section IV, Diagnostic Coding and Reporting Guidelines for Outpatient Services” from the official guidelines. The rules in sections II and III relate to non-outpatient settings.   Section II, “Selection of Principal Diagnosis” and Section III, “Reporting Additional Diagnoses” are for facility coding. Instructions related to the Uniform Hospital Discharge Data Set (UHDDS) do not apply to outpatient services and medical practices. According to the ICD-10-CM Official Guidelines, “Since that time, the application of the UHDDS definitions has been expanded to include all non-outpatient settings (acute care, short term, long term care and psychiatric hospitals; home health agencies; rehab facilities; nursing homes, etc.). The UHDDS definitions also apply to hospice services (all levels of care).”[1]  Guidance related to principal diagnosis and discharges in Section II and III do not apply to coding for medical practice outpatient services.

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Last revised December 1, 2022 - Betsy Nicoletti
Tags: HCC diagnosis coding

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Our mission is to provide up-to-date, simplified, citation driven resources that empower our members to gain confidence and authority in their coding role.

In 1988, CodingIntel.com founder Betsy Nicoletti started a Medical Services Organization for a rural hospital, supporting physician practice. She has been a self-employed consultant since 1998. She estimates that in the last 20 years her audience members number over 28,400 at in person events and webinars. She has had 2,500 meetings with clinical providers and reviewed over 43,000 medical notes. She knows what questions need answers and developed this resource to answer those questions. For more about Betsy visit www.betsynicoletti.com.

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