The DH is locked to one batting spot—and the team can lose the role.

The rule and version used here

This page applies the 2026 Official Baseball Rules issued by the Office of the Commissioner of Baseball, principally Rules 5.10 and 5.11, to Major League Baseball. MLB uses the DH in both the American and National Leagues in 2026. The rulebook’s summary of 2026 changes does not list an amendment to Rule 5.11.

The Official Baseball Rules also govern professional development leagues in MLB’s system, but a league or tournament can adopt supplemental regulations. College, school, youth and international competitions should not be assumed to use the MLB version. A verified NCAA difference appears below.

Ten names produce nine batters and nine fielders

With an ordinary DH, the starting lineup card identifies ten players: nine defensive players, including the pitcher, and a DH who occupies one of the nine places in the batting order. The pitcher has a defensive position but no batting turn; the DH has a batting turn but no defensive position.

Rule 5.11(a)(1) makes the designation cover the starting pitcher and all subsequent pitchers. A routine pitching change therefore does not change the DH or the batting order. The reliever simply becomes the pitcher for whom the existing DH bats.

The club must declare its choice on the lineup card

Under Rule 5.11(a)(1) and (3), using a DH is optional, but the club must select and identify one before the game. If it starts without a DH, it cannot add one later. If ten players are listed but nobody is marked as DH, the umpire can have the manager identify one of the nine non-pitchers before calling “Play”; the Rule 5.11(a)(1) Comment treats that as a correctable obvious error.

If the omission is raised only after play begins, Rule 5.11(a)(11) supplies a different correction. If the club has already played defense, the pitcher replaces in the batting order the listed player who did not take a defensive position. If it has not yet played defense, its manager chooses the listed player whom the pitcher replaces. That removed player is out of the game, the DH role ends, and earlier play counts, subject to the batting-out-of-turn rule.

The named starter normally must take one turn

MLB Rule 5.11(a)(2) requires the starting DH to come to bat at least once unless the opposing club changes pitchers first. A manager cannot ordinarily list a favorable matchup as the starting DH and replace that player before the first plate appearance merely because the matchup is no longer wanted.

This requirement concerns the named starting DH, not every later player in the role. Rule 5.11(a)(13) also says a later substitute for the DH need not be announced until the DH’s turn to bat.

A replacement inherits the DH role

A pinch-hitter for the DH becomes the new DH under Rule 5.11(a)(4). A substitute runner for the DH becomes the new DH under Rule 5.11(a)(6). In both cases, the batting-order position stays fixed; only the player occupying it changes.

The phrase “a Designated Hitter may not pinch-run” means the player already listed as DH cannot run for a different teammate. A bench player may pinch-run for the DH and then assumes the role. As with other MLB substitutions, a removed player cannot re-enter under Rule 5.10(d).

A multiple substitution cannot move the DH

Rule 5.11(a)(7) says the DH is “locked” into the batting order. A manager may replace the DH, but cannot use a double switch or another group of substitutions to move the DH role to a more convenient place in the rotation.

This is why the key question is not simply “Who is the DH now?” It is “Which batting position was designated before the game?” Every ordinary successor to the DH inherits that position.

The player can stay, but the DH role ends

Rule 5.11(a)(5) allows the DH to take a defensive position and continue batting in the original lineup spot. The cost is that the club loses the DH. With a single defensive replacement, the pitcher enters the batting order in the spot of the fielder who left. If several defensive substitutions occur at once, the manager must designate the new players’ batting positions.

This does not create a tenth fielder or remove the former DH automatically. It converts the club to a nine-player arrangement in which every defensive player has a batting-order position.

Five lineup moves end the ordinary MLB DH

For a club using the ordinary Rule 5.11(a) arrangement, the DH role ends for the remainder of the game when:

1. The game pitcher moves from the mound to another defensive position—Rule 5.11(a)(8).
2. A pinch-hitter bats for any lineup player and then becomes the pitcher—Rule 5.11(a)(9).
3. The game pitcher bats or runs for the DH—Rule 5.11(a)(10). The pitcher may pinch-hit or pinch-run only for the DH.
4. The DH takes any defensive position—Rule 5.11(a)(12).
5. A player already on defense moves to the mound to replace the pitcher—Rule 5.11(a)(14).

Failure to identify the DH until after the game starts can also terminate the role through the correction in Rule 5.11(a)(11). Once terminated, the role cannot be recreated later in that game.

Losing the DH changes the lineup; it is not an automatic out

There is no standalone run penalty, automatic out or special restart merely because a legal move terminates the DH. The manager and plate umpire establish where the pitcher and any simultaneous substitutes enter the batting order under Rules 5.10 and 5.11, and play continues with no DH.

From then on, the pitcher’s lineup position comes to bat like every other position. A later pitcher normally takes the batting-order position of the pitcher replaced. If the wrong player bats, the separate batting-out-of-turn provisions in Rule 6.03(b)—including their appeal timing—control the result; “the DH was lost” does not by itself decide that appeal.

Rule 5.11(b) separates one starter into two roles

If the starting pitcher will bat for himself, MLB Rule 5.11(b) tells the manager to list ten players and name that player twice: once as starting pitcher and once as DH. For Rule 5.11 purposes, the player is then treated as two separate people.

• If replaced as pitcher only, the player may remain as DH but cannot pitch again.
• If replaced as DH only, the player may continue pitching but no longer bats.
• If replaced in both roles at the same time, one incoming player cannot take both roles. The doubled listing is available only for the original starting pitcher/DH.
• Batting or running in the separately listed DH role, or assuming the mound from that DH role, does not by itself terminate the DH. Moving to a defensive position other than pitcher does.

This exception is created by the initial lineup card. A reliever, or a starting pitcher listed only as pitcher while somebody else is DH, does not later acquire the same two independent roles.

NCAA’s 2025–26 P/DH is not identical

NCAA baseball uses its own 2025 and 2026 NCAA Baseball Rules, Rule 7-2. Much of its ordinary DH structure resembles MLB’s, but its pitcher/designated-hitter procedure must be applied from the NCAA book:

• If the NCAA starting pitcher is listed in the batting order, that player automatically becomes the P/DH and is treated as separate pitcher and DH roles under Rule 7-2(b)(3).
• An NCAA game pitcher may pinch-hit or pinch-run only for the DH and become the P/DH under Rule 7-2(b)(10); ordinary MLB Rule 5.11(a)(10) instead says that move terminates the DH.
• NCAA Rule 7-2(b)(2) excuses the starting DH’s first plate appearance if the opposing pitcher changes or the DH becomes ill or injured. MLB Rule 5.11(a)(2) states only the opposing-pitcher-change exception.

Do not transfer those NCAA provisions to MLB, high-school, youth or local tournament play. Use the rules named in the competition’s regulations.

A pinch-runner replaces the DH

Situation: MLB’s number-five DH singles in the sixth inning. A bench player runs for him.

MLB 2026 ruling: under Rule 5.11(a)(6), the pinch-runner becomes the DH and remains in the number-five spot. The club has not lost the DH; the original player is removed and cannot return.

The DH moves to first base

Situation: the number-four DH replaces the number-seven first baseman on defense, with no other simultaneous substitution.

MLB 2026 ruling: the former DH stays number four, the pitcher enters the number-seven batting position, and the DH role is over under Rule 5.11(a)(5) and (12). The decisive fact is the DH’s move onto defense, not whether that player has already batted.

A shortstop becomes the pitcher

Situation: the current shortstop moves directly to the mound to replace the pitcher while the club has an ordinary DH.

MLB 2026 ruling: Rule 5.11(a)(14) terminates the DH. The club must complete the defensive and lineup substitutions with every remaining fielder occupying a batting position. A position player pitching does not preserve the DH merely because the former pitcher left the game.

The pitcher hits for the DH

Situation: a starting pitcher was listed only as pitcher, with a different player at DH. Later, the pitcher pinch-hits for that DH.

MLB 2026 ruling: the pitcher may bat in that spot, but Rule 5.11(a)(10) terminates the DH for the rest of the game. The special two-role protection does not apply because the starter was not named as both pitcher and DH on the initial card.

The pitcher/DH leaves the mound only

Situation: the starting pitcher is named twice, as pitcher and number-two DH. A reliever replaces him on the mound in the seventh inning, but no hitter replaces him.

MLB 2026 ruling: under Rule 5.11(b), the starter remains the number-two DH and continues to bat, but cannot return as pitcher. The club still has a DH because only the pitching role was replaced.

How to read a DH and lineup change

1. Name the ruleset and season. This decision path is MLB 2026, not a universal baseball rule.
2. Read the initial lineup card. Was there no DH, an ordinary DH, or a starting pitcher named separately as DH under Rule 5.11(b)?
3. Locate the DH’s fixed batting spot. A substitute can inherit it; a multiple substitution cannot move it.
4. Identify the exact move. Pinch-hitting or pinch-running for the DH preserves the role; taking defense or one of the other Rule 5.11(a) triggers ends it.
5. If the DH ends, place the pitcher and simultaneous substitutes. The identity of the removed fielder and the number of changes determine the new batting positions.
6. Keep the result permanent. Once the club loses the DH, no later move restores it that game.
7. Treat any batting-order mistake separately. Apply Rule 6.03(b) only if the wrong batter actually bats and the defense appeals at the required time.

Claims that confuse the role with the player

• “A substitute for the DH makes the pitcher bat.” No. A pinch-hitter or pinch-runner becomes the DH in the same spot.
• “The DH can play one inning of defense and then go back to DH.” No. Taking defense ends the club’s DH for the game.
• “A normal pitching change ends the DH.” No. The existing DH bats for the starting pitcher and subsequent pitchers.
• “Every pitcher who can hit gets the Rule 5.11(b) exception.” No. MLB requires the starting pitcher to be named twice on the initial lineup card.
• “The Ohtani rule and the roster designation for a Two-Way Player are the same rule.” No. Rule 5.11(b) controls the in-game pitcher/DH roles; roster classification is a separate eligibility and roster-limit question.
• “NCAA’s P/DH rule can answer an MLB lineup dispute.” No. NCAA Rule 7-2 contains materially different provisions.

Governing-body sources and effective versions

• Office of the Commissioner of Baseball — 2026 Official Baseball Rules, Rules 4.03, 5.10, 5.11 and 6.03(b)
• Major League Baseball — Designated Hitter Rule glossary (current MLB overview and 2022 universal-DH change)
• Major League Baseball — “What are the rules for two-way players?”, 29 April 2026 (Rule 5.11(b) examples)
• NCAA — 2025 and 2026 Baseball Rules, Rule 7-2 (Designated Hitter)
• NCAA — Baseball Playing Rules hub (current rulebook and 2025–26 interpretations)

Checked on 26 August 2026 against the Office of the Commissioner’s 2026 Official Baseball Rules and the NCAA 2025–26 rulebook. The MLB ruling is the baseline on this page; the NCAA material is a labeled comparison only. Competition regulations may supplement these books, so other professional, international, school, youth and tournament games require their appointed ruleset.