Nephrology practices have one of the highest patient volumes. It is also one of the most technically demanding medical specialties in terms of insurance billing. Every year, practices lose millions of dollars just because of simple mistakes that result in claim denials. In fact, about 14% of all nephrology claims are denied.
The only solution is to train the billers on the latest billing guidelines, tools, and rules.
That’s why we have created this guide. We will try to provide the important points that you need to remember in nephrology billing, some common challenges, and best practices that you and your team can put to work immediately.
So, let’s start.
Nephrology CMS Billing Guidelines
Before we get into the details, here is an important point that you must know. Nephrology is not like other specialties. Nephrology medical billing has two distinct billing models: standard evaluation and management (E/M) coding for chronic kidney disease (CKD) patients and the monthly capitation payment (MCP) system for end-stage renal disease (ESRD) patients on dialysis.
Now that we have cleared this distinction, here are some guidelines that are relevant for 2026:
ESRD Monthly Capitation Payment
The reimbursement for ESRD patients is different from that for other nephrology ailments. For ESRD patients who are on dialysis, Medicare uses MCP codes rather than per-visit billing.
These codes are selected on the basis of the patient’s age and the number of visits. Here are the most frequently used codes:
| CPT Code | Description | Visit Requirement |
|---|---|---|
| 90960 | ESRD monthly services, 20+ years of age. | 4 or more face-to-face visits. |
| 90961 | ESRD monthly services, 20+ years of age. | 2 to 3 face-to-face visits. |
| 90962 | ESRD monthly services, 20+ years of age. | 1 face-to-face visit. |
| 90967 | ESRD services per day, under 2 years of age. | Partial month (daily rate). |
The important point to note here is that you can only bill one MCP code per patient in a month. To ensure this, the date of service should span the entire month on the same line. If you try to use these codes for the middle-of-the-month services, the claim will be rejected.
Dialysis Session Codes
We have already discussed how the ESRD codes are billed. However, there are cases in which monthly MCP codes are not applicable. In these scenarios, dialysis sessions are billed using individual CPT codes. You cannot use these codes in the same month as an MCP code. Some important dialysis codes are:
| CPT Code | Description |
|---|---|
| 90935 | Hemodialysis procedure with single physician evaluation. |
| 90937 | Hemodialysis procedure requiring repeated physician evaluations. |
| 90940 | Hemodialysis access blood flow study. |
| 90945 | Dialysis procedure other than hemodialysis (e.g., peritoneal dialysis). |
| 90947 | Non-hemodialysis dialysis procedure requiring repeated evaluations. |
Evaluation and Management Coding
Many billers have a misconception about whether a separate E/M can be billed alongside an MCP code. Well, as we have already explained above, it is not permitted to do so, except in some situations.
A separate E/M is only billable when the physician treats a condition that is entirely unrelated to dialysis or ESRD management. To show that these services are unrelated, you must use modifier 25.
Another point to note about nephrology billing is that when a patient has both hypertension and CKD, you should use combination codes from the I12 or I13 series. Do not code I10 (hypertension) and N18.x separately.
Common Challenges in Nephrology Billing
The following are the most persistent challenges in-house teams face in nephrology billing and coding:
- MCP Visit Count Mismatches: The first and also one of the most preventable challenges in nephrology medical billing is selecting the right MCP code. A lot of the time, the MCP code that the biller uses does not match the number of patient visits. For instance, if you use CPT code 90960, but the documentation supports only two visits, this will be flagged as upcoding.
- Unspecified ICD-10 Coding for CKD: Using N18.9 (CKD, unspecified) when the physician has documented a specific CKD stage is a coding deficiency that payers flag consistently. Not only does it trigger denials, but it also fails to capture the correct Hierarchical Condition Category (HCC) weight.
- Incorrect Date of Service Reporting: We have already discussed this one. But since it is so important, we are mentioning it again. MCP claims are not like ordinary claims. They are submitted after the close of the billing month. The date of service on these claims should be from the start of the month to the end. Mid-month dates are not accepted.
Best Practices to Streamline Nephrology Billing & Coding
The following are some nephrology billing best practices that will help you avoid denials:
Track Monthly Visit Counts
First and foremost, you need to establish a tracking system in your practice that logs every face-to-face visit for patients. It does not have to be complicated. A simple tracking app that is connected to the billing system will work. It should flag when a patient crosses visit thresholds (one, two to three, four or more).
Conduct Coding Audits
Claim denials happen in every practice; they are inevitable. However, the rate of denials can be controlled. Practices that audit their nephrology billing and coding workflows every few months can catch errors before they accumulate into a big problem. A good practice is to conduct an audit after each quarter.
Verify Payer-Specific Authorization Requirements
Like all other medical specialties, prior authorization is also a big problem in nephrology billing. The rules for pre-authorization are different for every payer. So, you need to train your staff on the requirements of every major payer. This can be simplified by using billing software that can automatically tell you whether a service requires payer authorization or not.
Provide Detailed Documentation
Documentation is the most important part of any claim. Without it, no claim can pass, even if all other things are perfect. The following are some important documents that should be provided with nephrology claims:
For ESRD Monthly MCP Claims:
- A complete monthly assessment, including dialysis adequacy review, medication management, lab interpretation, and an updated plan of care.
- Individual dated notes for each visit.
- Identification of the MCP physician.
- ICD-10 codes.
- Documentation of any co-management visits.
For Vascular Access Procedures:
- A documented diagnosis confirming the medical necessity.
- The type of access created or revised.
- Prior authorization confirmation.
- Postoperative instructions.
Final Thoughts
Let’s wrap up everything we have discussed. Nephrology billing is hard, and this is evident from a 14% denial rate. There are many challenges, but you can overcome them with a proper strategy and the guidelines and best practices that we mentioned in this guide.
However, even with all the guidelines, billing can be frustrating for in-house teams. That’s why it is advisable to get professional nephrology billing services from companies like NeuraBill.
