Sbsq hosp ip/obs sf/low 25
CPT code 99231 covers follow-up visits to hospitalized patients who are stable or have minor problems. This is what doctors bill when they check on inpatients during their hospital stay who don't require extensive evaluation or management.
RVU breakdown
Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High
Billing tips
Bill only once per day per physician or physician group; subsequent visits by same specialty on the same day are bundled
Impact: Prevents automatic denials and recoupment; ensures compliance with one-per-day rule
Document medical decision-making complexity clearly to support level selection versus 99232 or 99233; 99231 requires straightforward or low complexity MDM
Impact: 99232 pays $68.71 (+$21.48 increase) and 99233 pays $99.60 (+$52.37 increase) with appropriate documentation
Ensure date of service is clearly documented and is not the initial hospital admission date (use 99221-99223 for admission)
Impact: Prevents denial for incorrect code selection; initial hospital care codes pay $89.47-$139.93
When multiple physicians from different specialties see the patient on the same day, each may bill separately with appropriate modifier AI for the principal physician
Impact: Allows appropriate reimbursement for concurrent care by different specialists without denials
Document time only if using time-based billing (more than 50% of encounter is counseling/coordination); otherwise use medical decision-making
Impact: 99231 typically requires 25 minutes for time-based billing; improper time documentation triggers audits
Review observation versus inpatient status before billing; same code applies to both but documentation should reflect actual patient status
Impact: Prevents medical necessity denials and ensures coordination with facility billing compliance
Common denials
Multiple same-day visits billed by same specialty group
How to appeal: Provide documentation showing services were provided by physicians of different specialties or that patient status significantly changed requiring separate evaluation. Submit specialty credentials and clear time separation if applicable.
Insufficient documentation of medical decision-making complexity
How to appeal: Submit complete medical record showing problem addressed, data reviewed, and risk level. Highlight differential diagnosis, treatment options considered, and clinical reasoning supporting straightforward/low complexity determination.
Billed on same day as admission when initial hospital care code should have been used
How to appeal: If service was truly subsequent care on a different calendar date, provide admission timestamp and subsequent visit timestamp. If error occurred, submit corrected claim with 99221-99223 as appropriate.
Medical necessity not established for continued hospitalization
How to appeal: Provide clinical rationale for continued inpatient status, citing InterQual or Milliman criteria met. Include documentation of ongoing treatments, monitoring requirements, or unstable conditions requiring hospital-level care.
Frequently asked questions
How much does Medicare pay for CPT code 99231 in 2025?
Medicare pays $47.23 for CPT code 99231 in 2025 based on the national average rate. This applies to both facility and non-facility settings, as the code is typically performed in hospital inpatient or observation settings.
What is the difference between 99231, 99232, and 99233?
The difference is the level of medical decision-making complexity. 99231 is for straightforward or low complexity (pays $47.23), 99232 is for moderate complexity (pays $68.71), and 99233 is for high complexity (pays $99.60). Select the code based on the complexity of problems addressed, data reviewed, and risk involved.
Can you bill 99231 on the same day as an admission?
No, you cannot bill 99231 on the same calendar date as the initial hospital admission. Use initial hospital care codes 99221-99223 for the admission day. 99231 is reserved for subsequent days of hospital or observation care.
How many times can 99231 be billed per day?
99231 can only be billed once per day per physician or same-specialty group. If multiple physicians from the same specialty see the patient on the same day, only one subsequent hospital care visit can be billed. Different specialties may each bill separately.
What RVU value does CPT 99231 have?
CPT 99231 has a total RVU of 1.46 for 2025, consisting of 1.0 work RVU, 0.38 practice expense RVU, and 0.08 malpractice RVU. These values are the same for both facility and non-facility settings.
Do I need to document time for CPT code 99231?
Time documentation is optional unless you are using time-based billing. For 99231, the typical time is 25 minutes. You can bill based on medical decision-making complexity instead of time, which is more common for subsequent hospital care visits.
Can nurse practitioners bill CPT 99231?
Yes, nurse practitioners and physician assistants can bill 99231 if they have hospital privileges and are performing subsequent hospital care within their scope of practice. Payment is typically 85% of the physician fee schedule rate unless they are billing incident-to a physician.