CPT code 90970


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I work for a Nephrology clinic and we are having issues billing for one of our dialysis codes. The way we typically would bill for patient who where transferred to a different dialysis center or deceased we would use a daily dialysis CPT code 90970 and use a range of dates from the first treatment date to the last treatment date. For example, if a patient deceased on 5/24/2023, and the patient was compliant with dialysis treatments, we would bill CPT 90970 one unit from date 5/1/2023 through 05/23/2023 creating a claim with 23 lines. We began having issues specifically with United Healthcare insurance because they are saying that we can only bill this code for the dates we have documentation for. Does anyone have any insight about how we can bill for this code correctly? Thanks!