Nephrology EHR Software

CKD ICD-10 Codes, Staging, and Comorbidity Billing Rules for Nephrology EHR

Chronic kidney disease staging is the foundation of nephrology billing accuracy. The 2026 ICD-10-CM N18 code family requires a specific stage code on every CKD claim. Non-specific N18.9 (CKD, unspecified) does not capture the correct HCC weight and routinely triggers Medicare Risk Adjustment (MRA) queries on chart audit. OmniMD’s nephrology EHR auto-populates the appropriate stage code from the patient’s most recent eGFR result and flags claims where N18.9 appears without clinical justification. Verified by Dr. Giri, 2026-06-19.

Hypertensive CKD coding rule: When hypertension and CKD coexist, ICD-10 convention assumes a causal relationship. Code I12.9 (hypertensive CKD, Stage 1-4) or I13.10 (hypertensive heart and CKD with Stage 5 or ESRD) rather than separate I10 and N18.x codes. Submitting I10 and N18.x separately is a coding error that payers flag as inconsistent and may deny. OmniMD’s nephrology templates automatically prompt I12.9 when both hypertension and a CKD stage code are present in the patient’s problem list. Key secondary codes for nephrology claims: Z99.2 (dialysis dependence, add to all ESRD encounters), E87.5 (hyperkalemia, extremely common in Stage 4-5 CKD), N25.81 (secondary hyperparathyroidism of renal origin, required for ESA and phosphate binder medical necessity), N17.9 (acute kidney injury, use G0491/G0492 for AKI dialysis rather than ESRD codes). See the AI-powered RCM and medical billing software pages for how OmniMD automates these coding rules at the point of care.

ESRD Monthly Capitation Billing: MCP Codes and Visit Documentation Requirements

When a patient transitions from CKD Stage 5 (N18.5) to ESRD (N18.6), the billing model changes entirely. CKD patients bill under standard E&M codes (99202-99215). ESRD patients shift to the Medicare monthly capitation payment (MCP) model, which pays a single monthly rate covering all dialysis-related care. The MCP code you bill depends on how many face-to-face visits the nephrologist documents in the billing month. OmniMD tracks in-center visit counts automatically and selects the correct MCP code, preventing the most common ESRD billing error: submitting 90960 (4+ visits) when documentation only supports 90961 (2-3 visits).

Age-stratified variants: Pediatric patients use different code ranges. Ages 12-19: 90957-90959. Ages 2-11: 90954-90956. Under age 2: 90951-90953. Each range follows the same visit-frequency structure (4+ visits, 2-3 visits, 1 visit) as the adult codes. Critical bundling rule: MCP codes (90960-90966) and dialysis session codes (90935-90947) cannot be billed for the same patient in the same month. MCP already includes dialysis session supervision, routine patient management, and lab interpretation. A separate E&M service (99213-99215) can be billed for a significant, separate medical problem unrelated to ESRD, but it requires Modifier 25 and complete documentation of the distinct clinical problem. OmniMD’s billing module enforces this bundling rule automatically and applies Modifier 25 when documentation supports a separate medical problem at the same visit. See the AI revenue cycle management page for how OmniMD handles ESRD MCP billing across in-center and home dialysis settings.

Dialysis Procedure CPT Codes and Vascular Access Billing for Nephrology Practices

Dialysis procedure codes (90935-90947) apply in two specific situations: (1) for non-ESRD patients receiving dialysis for acute kidney injury (AKI), and (2) for ESRD patients in months where the nephrologist is billing session-by-session rather than under the MCP monthly model. The distinction between AKI dialysis and ESRD dialysis is critical because Medicare introduced G0491 and G0492 specifically for AKI patients who are not on ESRD status. Using 90935 or 90937 for an AKI patient who has not yet been designated ESRD is correct; the G codes apply once the patient has an ESRD designation but the dialysis is being managed for an acute event distinct from their chronic ESRD management.

OmniMD’s nephrology procedure templates auto-select the correct dialysis code based on the patient’s ESRD designation status and the documented number of physician evaluations during the session. For vascular access procedures, the system links the access type to the active dialysis prescription and generates the access surveillance schedule (93990) automatically when flow metrics fall below the threshold documented in the patient’s vascular access plan. Modifier 25 applies when an E&M service is provided on the same day as a vascular access procedure for a separately documented clinical problem. See the AI RCM software page for how OmniMD’s coding engine handles G-code selection for AKI dialysis versus ESRD claims.

Nephrology Lab Codes, eGFR Thresholds, and Dialysis Adequacy Targets

Nephrology lab ordering is governed by a combination of CKD stage, dialysis modality, and payer-specific frequency limits. The renal function panel (80069) bundles albumin, calcium, carbon dioxide, chloride, creatinine, glucose, phosphorus, potassium, sodium, and BUN into a single billable unit when ordered as a panel. Ordering individual components separately when the panel is clinically indicated and all components are reviewed triggers NCCI bundling edits. OmniMD’s nephrology lab module presents the panel code as the default option and allows individual component unbundling only with a documented clinical reason, protecting against bundling denials.

Dialysis adequacy targets: For hemodialysis patients, KDOQI guidelines require a minimum Kt/V of 1.2 per session (single-pool) and a URR of at least 65%. OmniMD calculates Kt/V and URR automatically from the dialysis session data imported via the dialysis center interface and flags sessions where adequacy falls below target. Low adequacy triggers a clinical alert in the physician dashboard and prompts documentation of the clinical response — prescription adjustment, access evaluation, or referral — before the monthly billing cycle closes. For peritoneal dialysis, a weekly Kt/V of 1.7 (total, peritoneal plus residual renal function) is the minimum target. See the remote patient monitoring page for how OmniMD tracks between-session trends for home dialysis patients.

Who Should Use OmniMD Nephrology EHR Software?

• Independent and group nephrology practices managing CKD Stage 3-5 patients: OmniMD’s CKD staging calculator updates the ICD-10 code automatically from eGFR results, ensures the correct N18.x code appears on every claim, and tracks eGFR decline over time to anticipate the transition from CCM billing (Stage 3-5) to ESRD monthly capitation billing (90960-90962). Practices billing CCM for CKD patients report $60-$120 per patient per month in additional revenue from coordination services that were previously unbilled.
• Dialysis-affiliated nephrology practices billing ESRD monthly capitation: The MCP billing model requires accurate visit-count tracking month by month, correct age-stratified code selection, and enforcement of the bundling prohibition between MCP codes and session codes. OmniMD tracks monthly face-to-face visit counts, selects the correct 90960/90961/90962 code automatically, and flags months where a session code was submitted alongside an MCP code. The AI RCM software handles ESRD claim submission and tracks denial patterns by dialysis center and payer.
• Nephrology practices with home dialysis programs: Home hemodialysis (90963) and home peritoneal dialysis (90966) patients require monthly face-to-face visits plus remote data review of weight, blood pressure, and fluid balance. OmniMD’s remote patient monitoring integration captures daily home dialysis data, calculates Kt/V from patient-reported session parameters, and delivers the data to the physician dashboard before the monthly visit so the in-person encounter is spent on clinical decision-making rather than data collection.
• Transplant nephrology programs: Post-transplant patients require immunosuppressant level monitoring (tacrolimus, cyclosporine, mycophenolate), rejection surveillance, and long-term CKD management in the transplanted kidney. OmniMD’s transplant tracking module links donor information, transplant date, immunosuppressant protocol, and sequential creatinine and eGFR trends in a single timeline view.
• Nephrologists adding CCM revenue to an existing CKD panel: Practices with 50 CKD Stage 3+ patients who are not currently billing CCM can add $3,000-$6,000 per month in recurring revenue by enabling the OmniMD CCM module, which handles consent documentation, monthly time tracking, care plan generation, and claim submission.