Emergency Medicine Billing & Coding Guide
ED E/M 99281-99285, critical care 99291/99292, observation, fracture and laceration care.
Common Emergency Medicine CPT Codes
Ranked by claim frequency, with current MPFS work RVUs and global periods.
| Code | Description | Work RVU | Total RVU | Global |
|---|---|---|---|---|
| 99281 | Emr dpt vst mayx req phy/qhp | 0.25 | 0.33 | XXX |
| 99282 | Emergency dept visit sf mdm | 0.93 | 1.21 | XXX |
| 99283 | Emergency dept visit low mdm | 1.60 | 2.08 | XXX |
| 99284 | Emergency dept visit mod mdm | 2.74 | 3.54 | XXX |
| 99285 | Emergency dept visit hi mdm | 4.00 | 5.13 | XXX |
| 99291 | Critical care first hour | 4.50 | 9.25 | XXX |
| 99292 | Critical care addl 30 min | 2.25 | 4.01 | ZZZ |
| 12001 | Rpr s/n/ax/gen/trnk 2.5cm/< | 0.82 | 3.41 | 000 |
| 12002 | Rpr s/n/ax/gen/trnk2.6-7.5cm | 1.11 | 4.17 | 000 |
| 12004 | Rpr s/n/ax/gen/trk7.6-12.5cm | 1.40 | 4.85 | 000 |
| 12005 | Rpr s/n/a/gen/trk12.6-20.0cm | 1.92 | 6.32 | 000 |
| 12031 | Intmd rpr s/a/t/ext 2.5 cm/< | 1.95 | 7.78 | 010 |
| 12032 | Intmd rpr s/a/t/ext 2.6-7.5 | 2.46 | 8.98 | 010 |
| 12034 | Intmd rpr s/tr/ext 7.6-12.5 | 2.90 | 10.02 | 010 |
| 12035 | Intmd rpr s/a/t/ext 12.6-20 | 3.41 | 12.40 | 010 |
| 36415 | Coll venous bld venipuncture | 0.00 | 0.00 | XXX |
| 36416 | Collj capillary blood spec | 0.00 | 0.00 | XXX |
| 96372 | Ther/proph/diag inj sc/im | 0.17 | 0.46 | XXX |
| 96374 | Ther/proph/diag inj iv push | 0.18 | 1.13 | XXX |
What Emergency Medicine practices are leaving on the table
High-value services that consistently get under-billed across the specialty. Each one is rooted in current 2026 fee schedule and policy updates.
E/M level optimization: 30-40% of ER E/Ms are undercoded. A 99283 ($126) upgraded to a properly documented 99284 ($218) = $92/visit increase. Across 10,000 visits/year = $920K.
Critical care time capture: Many ER physicians don't bill critical care because they don't track time. Critical care (99291) pays $288 vs 99285 ($389). But 99291 + 99292 = $413+. Document time for every critical patient.
Modifier 25 on every E/M + procedure: Without modifier 25, the E/M gets denied. With it, you capture $70-389 additional per visit. Every ER visit with a procedure needs modifier 25.
Wound repair length summing: Sum all simple repairs into one code. A 2cm forehead + 3cm chin (both simple) = 12002 (5cm simple repair) which pays more than two separate 12001s.
Observation codes (99218-99220): When a patient is placed in observation from the ER, the admitting physician bills observation codes ($145-290) instead of or in addition to the ER E/M. Many ER physicians don't bill the ER E/M when admitting to observation — they should.
Code pairs that auto-bundle to CO-97
From the National Correct Coding Initiative for Emergency Medicine. The rationale tells you when a modifier legitimately bypasses the edit and when it cannot.
High-level E/M (99285) + critical care (99291): bill one or the other, NOT both. If patient becomes critical, bill only critical care time.
E/M + laceration repair: bill both with modifier 25 on the E/M. The E/M must document a separately identifiable problem beyond the laceration.
Simple repair (12001) + intermediate repair (12031) at different sites: bill both. Sum lengths by complexity class. Simple repairs at multiple sites = sum the lengths into one code.
Critical care: 99291 is first 30-74 minutes, 99292 is each additional 30 minutes. Below 30 min total = cannot bill critical care — use E/M instead.
IM injection (96372) + IV push (96374) on same date: separately billable — different routes. Document each administration separately.
Modifier Guidance for Emergency Medicine
When each modifier legitimately applies in this specialty, with denial-pattern context and audit-defense documentation.
CRITICAL in ER — nearly every ER visit involves E/M + procedure. Modifier 25 goes on the E/M code. Document: separate HPI, exam, and MDM for the E/M beyond the procedure.
Separate procedure — multiple wound repairs at different sites with different complexity levels. Sum lengths within each complexity class.
Repeat procedure — repeat X-ray after intervention (e.g., post-reduction X-ray). Bill the repeat with modifier 76.
Reduced service — used when a procedure is partially performed (e.g., attempted lumbar puncture, unsuccessful).
Multiple outpatient hospital E/M encounters — some payers require this when billing multiple E/M services on the same day for the same patient.
Documentation requirements
What needs to live in the encounter note for these codes to survive a payer audit.
- E/M level selection: 2021 guidelines apply. MDM-based: 99281 (straightforward), 99282 (low), 99283 (moderate), 99284 (moderate-high), 99285 (high). Document number of problems, data reviewed, and risk level.
- Critical care (99291): Document total critical care time, conditions requiring critical care (hemodynamic instability, respiratory failure, etc), specific interventions performed, and reassessments. Exclude separately billable procedures from time.
- Wound repair: Document wound length in cm (measure!), depth, location, contamination status, exploration performed, repair complexity (simple/intermediate/complex), materials used.
- Splint/cast: Document fracture/injury type, reduction performed (if applicable), splint/cast type and material, post-application X-ray if obtained.
OIG and audit triggers in Emergency Medicine
Patterns that show up in OIG Work Plans, RAC audits, and CERT improper payment reviews. Build internal compliance checks around these.
Critical care + E/M same day: You CANNOT bill both critical care (99291) and an ER E/M (99281-99285) for the same patient on the same day. Pick one. If >30 min of critical care time, bill 99291.
Wound repair complexity: Simple closure uses sutures, staples, or tissue adhesive. Intermediate requires layered closure (deeper than skin/subcutaneous). Complex involves debridement or extensive undermining. Bill the correct level.
Wound repair summing: Sum lengths WITHIN each complexity class, not across. 3cm simple + 4cm intermediate = 12001 (3cm simple) + 12032 (4cm intermediate). Do NOT sum to 7cm.
Missing modifier 25: The single most expensive billing error in ER medicine. Every E/M billed with a procedure needs modifier 25. Without it, the E/M is denied.
Critical care time documentation: Must document total critical care time explicitly. 'Patient was critical for 2 hours' is not enough. Document: 'I spent 45 minutes of critical care time at bedside' and list what was done.
Level downcoding risk: 99285 requires HIGH complexity MDM. If documentation only supports moderate complexity, the payer will downcode to 99284 and recoup $171. Ensure documentation matches the level billed.
Payer-specific billing notes
Where the major payers diverge from generic Medicare rules in Emergency Medicine.
ME Medicare +
Critical care time must be documented (start/stop or total time). Includes physician time only — not time patient is in the ER. 30-74 min = 99291. 75-104 min = 99291 + 99292. Procedures NOT included in critical care time: intubation (31500), CPR (92950), chest tube (32551).
UN UnitedHealthcare +
Strict on E/M level — will downcode 99285 to 99284 if documentation doesn't support high complexity. Requires medical necessity documentation for admit from ER.
AE Aetna +
Reviews ER visits for appropriate use — may deny or reduce payment for non-emergent conditions. Document why ER was appropriate (symptoms warranted emergency evaluation).
BC BCBS +
Varies by state. Some plans have ER copay that's waived if admitted. Most cover E/M + procedures without issues. Level downcoding is less common than UHC.
ME Medicaid +
Coverage varies by state. Some states have ER utilization management programs. Payment rates are typically 60-80% of Medicare. Prior auth not required for ER visits.
Standard Emergency Medicine coding workflow
1. Determine E/M level based on MDM complexity (problems, data, risk). 2. If critical care, document total time and switch to 99291/99292. 3. Bill all procedures performed (repairs, I&D, splints, injections). 4. Add modifier 25 to E/M when billing with ANY procedure. 5. Sum wound repair lengths within each complexity class. 6. Bill imaging guidance if used (76942 for ultrasound-guided). 7. Match ICD-10 to chief complaint — use S-codes for injuries, R-codes for symptoms. 8. For observation: bill 99218-99220 for observation admission, and bill ER E/M separately with modifier 25.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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