CPT code 99251 – Deleted inpatient consultation code, level 1

Key takeaways

CPT code 99251 was deleted from CPT on January 1, 2023, so a claim for a later date of service is rejected as invalid.

Before deletion, 99251 reported a level 1 inpatient consultation with a problem-focused history and exam, straightforward MDM and about 20 minutes.

For payers that pay consultations, report the same encounter with 99252, which needs straightforward MDM or 35 minutes of total time.

Medicare has not paid consultation codes since 2010, so consultants bill 99221-99223 for the first inpatient or observation visit instead.

CPT code 99251: Deleted status and historical descriptor

CPT code 99251 is a deleted code. The American Medical Association (AMA) removed it from CPT on January 1, 2023, together with the outpatient level 1 consultation code 99241. It used to report the lowest level of inpatient consultation, and it is invalid for any date of service after 2022.

Its descriptor required three key components. Those were a problem-focused history, a problem-focused examination and straightforward medical decision making (MDM). The presenting problems were usually self-limited or minor.

Use the table to recode old claims, since 99251 itself can no longer be billed. The sections below cover what replaced 99251 and how to fix a claim that still carries it.

Why the AMA deleted 99251 in 2023

The 2023 CPT update extended the 2021 office visit rules to hospital, observation and consultation services. Code levels now turn on MDM or on total time on the date of the encounter. History and examination are still documented, but they only need to be medically appropriate.

Under the old rules, 99251 and 99252 both rested on straightforward MDM. They differed only in the depth of history and exam. Once history and exam stopped setting the level, the two collapsed into one, and 99252 took over the lowest tier.

The update also folded observation into the inpatient codes. Before 2023, an observation consultation was reported with an outpatient consultation code. Since 2023, 99252-99255 cover inpatient and observation consultations alike.

What to bill instead of CPT 99251

For a payer that still pays consultations, bill 99252 for the encounter that used to be 99251. Select the level by MDM or by total time on the date, whichever the documentation supports. Confirm the payer’s consultation policy first, because many payers follow Medicare and no longer pay consultations.

Total time includes face-to-face and non-face-to-face work by the consultant on the date of the encounter. A 20-minute consultation with straightforward MDM still supports 99252, because it meets the MDM threshold. The documentation that supports that level is covered in full on our CPT code 99252 page.

Medicare: Initial and subsequent hospital care codes

Medicare has not recognized consultation codes since January 1, 2010, under CMS Transmittal 1875. A consultant who sees a Medicare patient in the hospital bills initial inpatient or observation care codes instead. The admitting physician appends modifier AI to mark the principal physician of record.

• 99221: Straightforward or low MDM, or 40 minutes. This is where most former 99251 encounters land for Medicare.
• 99222: Moderate MDM, or 55 minutes.
• 99223: High MDM, or 75 minutes.
• 99231-99233: Follow-up visits by the consultant, at 25, 35 or 50 minutes by level.

An outpatient Medicare consultation follows the same principle. It is billed with a new or established patient visit code from 99202-99215. Some Medicaid programs and Medicare Advantage plans follow the Medicare policy, so check each plan before billing 99252.

Why a 99251 claim is rejected and how to recode it

A claim with 99251 and a 2023 or later date of service fails code validation. Many clearinghouse edits stop it before it reaches the payer. When it does reach the payer, the remittance usually carries claim adjustment reason code (CARC) 181. It means the procedure code was invalid on the date of service.

An appeal cannot succeed, because the code no longer exists. The fix is a recoded claim, built in five steps.

1. Confirm the date of service: 99251 was valid only for encounters on or before December 31, 2022. Most of those claims are now past payer timely filing limits.
2. Identify the payer: Use 99252-99255 for payers that pay consultations. Use 99221-99223 or 99231-99233 for Medicare and the plans that follow it.
3. Rescore the note: Apply the 2023 MDM table, or total time on the date, to the note as written. Never add documentation after the fact to reach a level.
4. Resubmit the right way: Send a new claim if the original was rejected before adjudication. Send a corrected claim (frequency code 7) if the payer adjudicated and denied it.
5. Fix the source: Remove 99251 from the charge master, the superbill and any saved code favorites so no one can select it again.

Steps 1 and 2 decide the replacement code, and the diagram below maps both questions.

Our reference on medical billing denial codes explains CARC 181 and the related remark codes a payer may attach.

Documentation requirements for the replacement codes

The consultation rules that applied to 99251 still apply to 99252-99255. Payers that pay consultations look for three elements in the record.

• Request: The requesting provider’s name and the clinical question, documented before the consultation.
• Opinion: The consultant’s own assessment, with a medically appropriate history and exam.
• Report: A written opinion sent back to the requesting provider, with the date and method noted.

Add the MDM elements or the total time that support the level billed. A note with straightforward MDM earns 99252, however brief the encounter felt. Payers also check the claim’s administrative fields, such as patient and provider identifiers, alongside the note.

99251 vs 99241: The two deleted level 1 consultation codes

The AMA removed the level 1 code from both consultation families on the same date. Both families now start at straightforward MDM, so a former level 1 encounter lands on the level 2 code.

How Pabau keeps deleted codes off your claims

Deleted codes survive in billing systems long after the AMA retires them. A superbill template, a saved favorite or an old charge list keeps offering 99251 to whoever codes the visit. Pabau, the practice management and billing platform we build, checks each claim for missing details before it leaves the practice.

Our claims management software submits electronic claims through our Claim.MD integration and tracks each claim’s status. Real-time eligibility checks confirm the patient’s plan before the visit is coded. The coder can then choose 99252 or 99221 for the right payer.

Electronic remittance advice (ERA) posts back to the same dashboard. A rejection for an invalid code sits next to the claim that carried it, so the billing team can retire the code in its template.

Stop deleted codes before they reach the payer

Pabau runs eligibility checks, submits claims through Claim.MD and posts remittances back to each claim, so a rejected 99251 gets recoded fast.

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Conclusion

CPT 99251 is a lookup question with a short answer. The code is gone, and the encounter it described now belongs to 99252 or, for Medicare, 99221. A claim that still carries it points to a template nobody updated in 2023.

Fix it at the source and the rejections stop. Retire the code in every template, rescore open claims by MDM or time, and route Medicare consultations to hospital care codes. Book a demo to see how Pabau checks consultation claims before they leave the practice.

Continue your research

Billing the code that replaced 99251? CPT code 99252 covers the documentation, MDM level and payer rules for the lowest current consultation level.

Need to understand how clean claims prevent consultation denials? Clean claim requirements explains every field a payer checks before processing a hospital billing submission.

Want a broader view of the billing cycle behind consultation codes? Revenue cycle management covers the end-to-end process from patient registration through payment posting.

Seeing CARC 181 on old consultation claims? Denial codes in medical billing maps every common CARC and RARC to its root cause and corrective action.

Recoding a deleted 99241 outpatient consult too? CPT code 99242 covers the outpatient consultation level that replaced it.

Frequently asked questions