CPT code 99243: Outpatient consultation billing guide

Key Takeaways

CPT code 99243 describes an office or other outpatient consultation requiring moderate complexity medical decision making (MDM) or approximately 40 minutes of total time on the date of the encounter.

All three Rs of consultation documentation are mandatory: a written request from the referring provider, the reason for consultation, and a written report sent back to the requesting provider.

Medicare eliminated outpatient consultation codes 99241-99245 in 2010; practices must bill E/M codes (99202-99215) for Medicare patients and verify commercial payer policies individually.

Pabau’s claims management software helps specialty practices automate consultation documentation checklists, flag missing three Rs elements, and submit cleaner claims through Claim.MD.

CPT code 99243 is defined by the American Medical Association (AMA) CPT code set as: Office or other outpatient consultation for a new or established patient, which requires a medically appropriate history and/or examination and moderate complexity medical decision making. Typically, 40 minutes of total time is spent on the date of the encounter.

The code belongs to the outpatient consultation family, 99241-99245, maintained by the AMA. Effective with the 2023 E/M guideline revisions, the history and physical examination components are no longer required elements for code selection. Complexity is determined by either MDM level or total time on the date of the encounter, not by the number of elements documented in the note.

One compliance point that catches many practices off guard: Medicare eliminated the 99241-99245 consultation code family effective January 1, 2010. Under the CMS Medicare Physician Fee Schedule, practices must bill E/M codes 99202-99215 for Medicare Part B beneficiaries. CPT code 99243 remains recognized by many commercial payers and some state Medicaid programs, but verify individual payer contracts before billing.

Medical decision making requirements for CPT code 99243

Moderate complexity MDM is the clinical threshold for CPT code 99243 under MDM-based billing. The 2023 AMA E/M guidelines define MDM across three elements: the number and complexity of problems addressed, the amount and complexity of data reviewed, and the risk of complications or morbidity.

To qualify as moderate complexity, at least two of the three MDM elements must meet the moderate threshold. The table below summarizes what each element requires.

Clinical judgment and complete documentation determine the final code selection. Upcoding to 99244 or 99245 when MDM meets only the moderate threshold is a documented OIG audit trigger. For additional context on how billing complexity maps to reimbursement, the AAPC’s CPT code reference provides detailed MDM crosswalk tables.

Time-based billing: The 40-minute threshold

Providers who prefer time-based billing can use CPT code 99243 when total time on the date of the encounter reaches approximately 40 minutes. Under 2023 AMA guidelines, total time includes pre-encounter work, face-to-face time with the patient, and post-encounter work completed on the same calendar date.

The consultation code family time thresholds are:

Time must be accurately documented in the medical record. The note should state the total time and what activities were performed. Inflating encounter time constitutes fraud under federal billing law. When the clinical complexity clearly supports a different MDM level than the time would suggest, use MDM-based billing instead.

Documentation requirements: the three Rs

Consultation codes carry a documentation requirement that standard E/M codes do not: the three Rs. All three must appear in the medical record for the claim to be payable under payers that recognize 99241-99245. Understanding medical billing fundamentals starts with getting these right on every consultation encounter.

• Request: A written request from the referring or requesting provider must be documented. A verbal request alone is insufficient; the note must reference that a formal request was made and who made it.
• Reason: The specific reason for the consultation must be documented. This is the clinical question the requesting provider needs answered, not a generic referral phrase like “evaluate and treat.”
• Report: A written report of findings and recommendations must be communicated back to the requesting provider. The report, or evidence it was sent, must appear in the record.

Practices submitting electronic claims via the 837 file format should confirm that the three Rs are captured in structured fields, not just buried in free-text notes. Payers audit consultation claims specifically for these elements, and a missing report is the single most common documentation-related denial reason for this code family.

2026 Medicare reimbursement rates

Because CMS eliminated consultation codes for Medicare Part B in 2010, CPT code 99243 does not appear on the 2026 Medicare Physician Fee Schedule for Part B claims. Practices billing Medicare patients for consultation-type encounters must use the appropriate E/M code (99202-99215) based on the complexity of the encounter.

For commercial payers and state Medicaid programs that do recognize CPT code 99243, payment rates vary by payer contract and geographic location. Based on third-party fee schedule data, the national average non-facility rate for 99243 ranges from approximately $130 to $145 for commercial payers; however, practices should verify the actual contracted rate with each payer directly. The CMS Physician Fee Schedule lookup tool provides the official benchmark data that many commercial payers use as their reference.

Practices billing through a clearinghouse can use Pabau’s Claim.MD clearinghouse integration to verify payer eligibility, submit 837P claims electronically, and track ERA responses in real time, reducing the manual follow-up burden on billing staff.

Facility vs non-facility rates

Where CPT code 99243 is recognized, payers typically apply different rates depending on the place of service. Non-facility rates (office setting, POS 11) are higher because the practice absorbs overhead costs. Facility rates (hospital outpatient, POS 22) are lower because the facility separately bills for overhead. Using the wrong place of service code is a common denial trigger reviewed in more detail below.

RVU breakdown for CPT code 99243

Relative Value Units determine how consultation fees are calculated. The FastRVU 2026 RVU lookup tool and the PCC free 2026 RVU calculator can pull current values directly from CMS data. For reference, CPT code 99243 carries the following approximate RVU structure (verify via CMS data for the current fiscal year):

The payment rate equals total RVU multiplied by the CMS conversion factor, then adjusted by your locality’s Geographic Practice Cost Index (GPCI). Practices in high-cost metropolitan areas receive a higher GPCI adjustment than rural areas. Review electronic remittance advice for each payer to confirm the GPCI-adjusted rate being applied to your claims.

Modifiers applicable to CPT 99243

Several modifiers may apply to CPT code 99243 depending on the clinical circumstances. Incorrect modifier use is an OIG audit priority, so apply these only when the clinical record supports them.

Always verify modifier requirements with the specific payer. Some commercial plans have their own modifier rules that differ from AMA or CMS guidance.

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CPT 99243 vs 99244: Choosing the right code

The most common coding error in the outpatient consultation family is selecting between 99243 and 99244. The MDM distinction comes down to whether prescription drug management is involved (moderate) or whether the problem carries substantial risk of morbidity or requires an elective major procedure (high). The comparison below clarifies the full family.

When the consultation involves initiating a new prescription for a chronic condition but the overall risk does not rise to the level of elective major surgery, 99243 is the appropriate code. Select 99244 only when the documentation clearly supports a higher risk level or substantially more time. For additional context on related consultation billing, see our outpatient consultation billing guides for adjacent code families.

ICD-10 codes commonly billed with CPT 99243

CPT code 99243 is used across specialties whenever an outpatient consultation meets the moderate complexity threshold. The diagnosis codes paired with it vary by specialty but typically reflect the types of chronic and complex conditions that generate referrals for specialist opinion.

The diagnosis code must accurately reflect the condition addressed during the consultation, not simply a general referral reason. Payers cross-reference ICD-10 codes against the billed CPT code to confirm medical necessity, so specificity matters.

Common billing errors and denial reasons

Denials on consultation codes cluster around a predictable set of errors. Addressing these systematically reduces rework and protects revenue. Effective denial management workflows should flag each of these at the pre-submission stage.

• Missing three Rs: The most common reason. One or more of the request, reason, or report elements is absent from the medical record. Audit each consultation note before submission.
• MDM level not supported: The note documents a problem and management plan but fails to meet two of the three moderate complexity MDM elements. Coders should map each encounter against the MDM table before selecting the code.
• Incorrect place of service code: Billing POS 11 (office) when the encounter occurred in a hospital outpatient department (POS 22) results in a rate discrepancy denial. Confirm POS against the actual encounter location.
• Payer does not recognize consultation codes: Many commercial plans and some Medicaid programs have adopted the Medicare policy and require E/M substitution. Submitting 99243 to these payers without verifying their policy generates an immediate rejection.
• Missing or incorrect modifier: Appending Modifier 25 to the procedure code rather than the E/M, or failing to append Modifier 57 when a major surgery decision was made, disrupts payer editing logic.
• ICD-10 code not supporting medical necessity: A vague or unspecified diagnosis code that does not reflect the documented complexity of the problem fails medical necessity review for a moderate-level consultation.

Tracking clean claim submission rates by code is the fastest way to identify which of these errors is driving your denial rate. A claim that requires correction and resubmission adds an average of 15-30 days to the payment cycle for each encounter affected.

Payer-specific rules: Commercial insurance and Medicaid

This is the area where most billing guides fall short. Whether CPT code 99243 is payable depends entirely on the specific payer, and the variation is wide.

Commercial payers fall into three categories regarding outpatient consultation codes:

• Full recognition: The payer accepts 99241-99245 and pays according to its contracted fee schedule. Documentation requirements (three Rs) still apply.
• E/M substitution required: The payer follows Medicare’s 2010 policy and requires providers to bill 99202-99215 instead. Submitting 99243 results in a denial or rejection.
• Partial recognition: Some plans recognize consultation codes only for certain specialties (e.g. surgical specialists, oncology) or only in specific settings.

State Medicaid programs are equally variable. Some states fully recognize the consultation code family; others have adopted E/M substitution. Practices billing across multiple payers should maintain a payer-specific billing rules table and review it when contracts renew. Staying current on medical billing compliance requirements across payer types protects against unexpected denials when payer policies change mid-year.

How practice management software streamlines outpatient consultation billing

Consultation billing errors are almost always documentation failures, not clinical ones. The three Rs are forgotten, the MDM table is not checked, the place of service is auto-filled incorrectly. These are workflow problems that practice management software is designed to address. Improving revenue cycle management for specialty practices starts with closing those gaps before claims are submitted.

Pabau’s claims management software connects encounter documentation directly to claim submission. Billing staff can see whether the three Rs are captured as part of the chart review workflow before the claim goes out. For psychiatry and other specialties that rely heavily on the consultation code family, the psychiatry EMR software module supports structured consultation note templates that prompt for each required element.

Claims submitted through Pabau route to payers via the Claim.MD clearinghouse, which supports real-time eligibility verification, 837P electronic claim submission, and ERA/835 remittance tracking. That means practices can confirm whether a specific payer recognizes 99243 before submitting, not after receiving a denial.

The superbill documentation generated at the point of care feeds directly into the claim, reducing re-keying errors that are a common source of preventable rejections.

For practices managing digital intake forms and consultation workflows in Pabau, the referring provider details captured on intake can pre-populate the request and reason elements of the three Rs, removing the need for staff to reconstruct that information from memory at claim time.

Conclusion

Consultation code denials are largely preventable. For CPT code 99243, the three Rs are the compliance foundation, MDM documentation determines code selection, and payer policy determines whether the code is even recognized. Getting all three right before submission is where billing efficiency lives.

Pabau’s integrated medical billing workflow connects clinical documentation to claim submission, with built-in Claim.MD clearinghouse routing to verify payer eligibility and catch errors before they become denials. To see how it works for specialty consultation billing, book a demo.

Continue your research

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Managing denials across multiple payers? Denial codes in medical billing provides a reference guide to the most common CARC and RARC denial reason codes.

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