CPT code 95813 – Extended EEG monitoring, 61-119 minutes

Key takeaways

CPT Code 95813 covers EEG recording and interpretation lasting 61-119 minutes, between 95812 (41-60 minutes) and the 95700-95726 series (2+ hours).

Documentation must include explicit start and stop times confirming a duration of 61-119 minutes, plus a signed interpretation report.

Medicare reimburses 95813 globally; use modifier 26 when the neurologist interprets only and does not own the recording equipment.

Top denial causes: duration not documented as 61-119 minutes, missing signed report, and absent or non-matching ICD-10 diagnosis code.

CPT Code 95813: Official descriptor and procedure overview

CPT Code 95813 is defined by the American Medical Association (AMA) as: Electroencephalogram (EEG) extended monitoring; 61-119 minutes. The AMA revised the descriptor effective January 1, 2020, adding the 119-minute cap. The session must exceed 60 minutes of continuous recording time, not approach it. A recording of 2 hours or more moves to the long-term series, 95700-95726.

When billed globally, the code covers two distinct services. The technical component is electrode placement, operation of the recording equipment, and the EEG tracing itself. The professional component is the neurologist’s interpretation of the tracing and their signed written report. Split billing between a facility and an interpreting physician requires the correct modifier, covered below.

This code applies in both inpatient and outpatient settings. It is ordered most often for prolonged seizure evaluation, encephalopathy workup, and altered mental status assessments. In each, a standard 20-40 minute tracing is too short to capture the diagnostic information.

What CPT 95813 covers and what it excludes

CPT Code 95813 covers routine extended EEG with standard scalp electrode placement, continuous recording of 61-119 minutes, and a written interpretation. It does not cover every long-duration brain monitoring study.

These services sit outside 95813 and are reported with their own codes:

• Ambulatory EEG (AEEG): A recording the patient wears at home over 24-72 hours. Ambulatory studies fall under the 95700-95726 series, using the unattended technical codes, rather than 95813.
• Long-term EEG monitoring (95700-95726): The code series introduced in 2020 for long-term recording, whether attended in an epilepsy monitoring unit (EMU) or unattended at home. These codes are not reported alongside 95813.
• Electrocorticography: Intraoperative or invasive cortical recordings use distinct codes.
• Intraoperative neurophysiologic monitoring (IONM): EEG performed during surgery is coded through the IONM code family, not 95813.

When a monitoring session runs under 61 minutes or reaches 2 hours, do not report 95813. Under 61 minutes bills as 95812, and 2 hours or more moves to 95700-95726. The duration threshold is strict, and payers audit duration-based codes closely.

95812 vs 95813: How to choose the right EEG code

CPT 95812 covers EEG recording lasting 41-60 minutes; CPT Code 95813 covers recording lasting 61-119 minutes. Duration is the only distinguishing factor between the two codes. At 2 hours or more, neither applies, and the study moves to the long-term series, 95700-95726.

This distinction trips up practices that use approximate time documentation. If a note reads “approximately one hour,” a payer may deny 95813 for insufficient evidence that the 61-minute threshold was crossed. Record exact start and stop times every time.

A session that runs 59 minutes bills as 95812. A session that runs 61 minutes bills as CPT Code 95813. A session that runs 2 hours or more bills from the 95700-95726 series. There is no interpolation between codes.

CPT 95813 and the related EEG code family

Understanding where CPT Code 95813 sits within the broader EEG code family prevents miscoding to neighboring codes. The AAPC’s CPT code reference organizes these codes by duration and monitoring type.

The long-term series (95700-95726, effective 2020) replaced the older 95950-95953 and 95956 codes. Once a recording reaches 2 hours, those codes apply instead of CPT Code 95813. That holds in an epilepsy monitoring unit and at home.

Documentation requirements for CPT Code 95813

Incomplete documentation is the leading cause of 95813 denials. Before submitting a clean claim, verify that every element below appears in the medical record.

• Explicit start and stop times: The record must state the precise time recording began and ended, with the calculated duration of 61 to 119 minutes. Approximate language (“approximately one hour”) does not meet payer standards.
• Signed physician interpretation and report: The interpreting neurologist must sign a formal written report. An unsigned preliminary read or verbal report is not billable.
• Clinical indication: The reason the extended study was ordered must appear in the note. Linking the clinical indication to the supporting ICD-10 diagnosis code on the claim is essential for medical necessity.
• Ordering provider identification: The provider who ordered the study must be identifiable in the record.
• Electrode placement and recording methodology: The technical component must document the number of channels, electrode placement approach, and any activation procedures performed.

Payers conducting post-payment audits look specifically for the duration evidence. Without start and stop times in the record, the practice cannot defend a 95813 claim even if the session genuinely ran 61-119 minutes.

ICD-10 diagnosis codes that support CPT Code 95813

The claim’s supporting diagnosis codes must demonstrate medical necessity for extended EEG monitoring. Use a CPT-to-ICD-10 crosswalk tool to verify payer-accepted pairings for specific clinical scenarios. Commonly accepted ICD-10-CM codes include:

Use the most specific ICD-10-CM code available for the clinical situation. Payers increasingly flag claims where the diagnosis code is a broad unspecified category when more specific codes exist. For encephalopathy, distinguish toxic, metabolic, and unspecified presentations where the documentation supports it. Toxic encephalopathy codes to G92.8 (other toxic encephalopathy) or G92.9 (unspecified toxic encephalopathy). Metabolic encephalopathy codes to G93.41, and unspecified encephalopathy to G93.40.

Medicare reimbursement for CPT 95813

Medicare pays for CPT Code 95813 through the annual Medicare Physician Fee Schedule (MPFS), published by the Centers for Medicare and Medicaid Services (CMS). Payment rates change each calendar year and vary by geography through the Geographic Practice Cost Index (GPCI). Always verify the current rate using the CMS MPFS lookup tool rather than relying on figures from prior years.

The FastRVU 2026 RVU lookup provides current Work RVU (wRVU), Practice Expense RVU (PE RVU), and Malpractice RVU (MP RVU) values for 95813. The national payment amount is calculated as [(Work RVU × Work GPCI) + (PE RVU × PE GPCI) + (MP RVU × MP GPCI)] × Conversion Factor.

When the neurologist performs interpretation only and does not own or operate the recording equipment, bill with modifier 26 (professional component). The facility or EEG lab billing the technical component appends modifier TC. Global billing (no modifier) applies when one entity provides both the recording and the interpretation.

Prior authorization and payer policy for CPT 95813

Prior authorization requirements for CPT Code 95813 vary by payer type and individual plan. Medicare fee-for-service does not require prior authorization for 95813. Medicare Advantage plans set their own authorization rules, and many require pre-certification for extended EEG studies.

Commercial payers and Medicaid managed care organizations commonly require PA for extended EEG when the clinical indication is not a confirmed epilepsy diagnosis. Supporting documentation typically requested includes:

• Ordering physician’s clinical notes documenting the indication
• Prior EEG results (if applicable) showing why a standard-duration study was insufficient
• The specific ICD-10 diagnosis code being worked up
• Expected duration and setting of the planned study

CMS publishes Local Coverage Determinations (LCDs) through Medicare Administrative Contractors (MACs) that define medical necessity criteria for EEG services by jurisdiction. Search the Medicare Coverage Database at lcd.cms.gov for the LCD applicable to your MAC region. Meeting LCD criteria is not the same as meeting commercial payer criteria, so verify each payer separately before the study.

Reviewing medical billing compliance protocols for prior authorization tracking helps neurology practices prevent authorization-related denials before the claim is even submitted.

Common modifiers used with CPT Code 95813

Three modifiers appear regularly on 95813 claims, and a fourth belongs on the same-day E/M code. Using the wrong one, or omitting a required one, is a steady source of denials in neurology medical billing.

The National Correct Coding Initiative (NCCI) may bundle 95813 with a same-day evaluation and management (E/M) service, depending on the edit pair. The fix for that bundle belongs on the E/M code. Append modifier 25 to the E/M code when the visit was significant and separately identifiable from the EEG. Modifier 59 on 95813 is reserved for NCCI edits between two procedures. Check the current NCCI table for the code pair before appending either one.

Top reasons CPT 95813 claims are denied and how to prevent them

Most 95813 denials share the same root causes. Identifying them in advance is what denial management workflows are designed to prevent, and what claims management software automates at the point of submission.

• Duration not documented as 61-119 minutes: The most common denial. Without explicit start and stop times in the record showing 61-119 minutes of recording, payers cannot verify code selection. Corrective action: Mandate time-stamped technologist recording sheets and confirm they are scanned into the record before billing.
• Missing signed interpretation report: The professional component requires a formal written report bearing the interpreting neurologist’s signature. Unsigned drafts, verbal interpretations, or handwritten notations are not acceptable. Corrective action: Implement a workflow that holds the charge until the signed report is attached.
• Diagnosis not supporting medical necessity: Billing 95813 with a vague or non-specific ICD-10 code without sufficient clinical context prompts medical necessity denials. Corrective action: Match the most specific available ICD-10 code to the clinical indication documented in the ordering note.
• Modifier errors: Billing globally when the neurologist only interpreted, or billing with modifier 26 when the practice also owned the recording equipment. Corrective action: Establish a site-of-service verification step during charge entry.
• Missing prior authorization: Commercial and Medicare Advantage plans often require PA for extended EEG. Submitting without it results in denial regardless of clinical appropriateness. Corrective action: Build a PA verification checkpoint into the scheduling workflow, before the study is performed.
• Same-day E/M billed without modifier 25: Where an NCCI edit pairs 95813 with the visit’s E/M code, the E/M needs modifier 25 to be paid. The note must also document a separate service. Corrective action: Audit same-date claims monthly for NCCI edit pairs involving 95813.

Each of these causes has one point in the claim’s path where it costs the least to stop. The workflow below maps them in order.

When a 95813 claim still comes back unpaid, the remittance names the reason with a claim adjustment reason code. Our guide to denial codes explains what each common code means and how to correct the claim before resubmitting.

How Pabau catches 95813 claim errors before submission

Without a check at submission, a 95813 error surfaces on the remittance. The coder then corrects the modifier or the diagnosis code and resubmits, often weeks after the study was read.

In Pabau’s claims management software, US claims go out through the Claim.MD clearinghouse, which reaches thousands of US payers. Each 95813 claim runs through claim scrubbing before submission. Modifier errors and missing diagnosis code pairings surface while the claim is still in the practice, rather than at remittance.

The patient’s case also tracks the prior authorization code, its dates and its sessions, with a warning when one is missing. Eligibility checks run before the study, and ERA remittances post back once the payer responds. The team sees each 95813 claim from authorization to payment in one place.

Submit cleaner 95813 claims

Pabau scrubs each claim before it reaches Claim.MD, so 95813 modifier and diagnosis errors surface at submission instead of on the remittance.

Book a demo

Conclusion

Treat the recorded start and stop times as the deciding field on every 95813 claim. Duration picks the code, and auditors look for that evidence first.

The other checkpoints cost little by comparison. Confirm authorization at scheduling, hold the charge for the signed report, and check same-day E/M pairs before submission. Building those steps into your revenue cycle management process trades a few minutes per study for far fewer appeals.

Book a demo to see how Pabau carries a 95813 claim from charge entry to Claim.MD submission, with claim scrubbing on every claim.

Continue your research

Need to understand how clearinghouse submission works for neurology claims? Claim.MD clearinghouse overview explains how electronic claim routing reaches payers and what happens at each step.

Got a 95813 claim back with a reason code? Denial codes in medical billing breaks down the most common CARC codes your team will see on remittance for neurology services.

Coding an EEG ordered for confusion or disorientation? ICD-10 code R41.82 explains when altered mental status, unspecified, is the right diagnosis to report.

Ordering the study after a fainting episode? ICD-10 code R55 covers how syncope and collapse are coded and documented.

Need one charge form for multi-code neurology visits? Superbill guide for practices covers how to structure charge capture for visits that include EEG services.

Frequently asked questions